Washington Monument

Stand at the base and tilt your head back. The white stone rises straight up until it seems to lean against the sky. The flags snap and ripple in a ring around you, and the wind carries the sound of their ropes knocking against the poles. Underfoot, the ground slopes gently upward. You are standing on a small hill at the centre of the National Mall, and every line of this city seems to run toward the point where you stand.

This is the Washington Monument, a hollow obelisk of marble, granite, and sandstone built to honour George Washington. He commanded the army in the American Revolution and became the first President of the United States. An obelisk is a tall, four-sided pillar that narrows to a pyramid at the top. The form comes from ancient Egypt, where obelisks stood at temple gates. Here, the shape has no carvings, statues, or columns. It is just one clean line, and that plainness is the design.

It did not begin so simple. In the 1830s, a private group called the Washington National Monument Society raised money and chose a design by the architect Robert Mills. His original plan was grand. It placed the obelisk on top of a wide circular building with columns, a kind of temple filled with statues of national heroes. Over the years that base was quietly dropped. Money was short, tastes changed, and in the end only the shaft was built.

The cornerstone was laid on the Fourth of July, 1848, with a large public ceremony. Work moved steadily for several years. Then, in the 1850s, it stopped. The Society ran out of money, and politics made things worse. A nationalist political party known as the Know-Nothings took control of the Society for a time. Donations dried up, and the half-built stump stood on the Mall for more than two decades.

One story from that period is strange but true. Many states, cities, organisations, and even foreign nations sent carved stones to be set into the monument's walls. One stone came from Pope Pius the Ninth in Rome. In 1854, a group of men broke into the work yard at night and carried the Pope's stone away. It was never recovered. Most historians link the theft to the anti-Catholic feeling of the time. Decades later, a replacement stone was sent and set inside.

Then came the Civil War, the conflict between the northern and southern states in the 1860s. The unfinished stump sat in a landscape of army camps, and cattle grazed nearby to feed the troops. Mark Twain, the American writer, mocked the stub in print. He compared it to a factory chimney with the top broken off. For years, this was the face of the nation's tribute to its first president: an abandoned stump of stone.

Now look carefully at the walls, about a quarter of the way up. Do you see it? The colour changes. The lower section is a slightly different shade from the stone above. This line marks the long pause in construction. When work resumed after the war, the builders could not get stone that matched exactly. The marble came from different quarries, and it has weathered differently over time. Many visitors walk the entire Mall without noticing this. Once you see it, you cannot miss it.

In 1876, the country's hundredth birthday, Congress finally took over the project. The Army Corps of Engineers led the work, under an engineer named Thomas Lincoln Casey. His first task was not to build up, but to dig down. The old foundation was too weak for the full height, so his team strengthened and widened it beneath the existing stump. Only then could the walls rise again. They also adjusted the design, giving the shaft classic Egyptian proportions with a pointed pyramid on top.

The capstone was set in December 1884, and the monument was dedicated in February 1885. The final height is just over 555 feet, which is about 169 metres. When it was finished, it was the tallest human-made structure in the world. It held that title for only a few years, until the Eiffel Tower opened in Paris in 1889. It is still the tallest stone structure of its kind anywhere on Earth.

Here is a second detail that most people never see. At the very tip sits a small pyramid of aluminium. In the 1880s, aluminium was rare and expensive, more prized than silver, and the builders chose it as a lightning rod and a crowning touch. One face of the tip carries two Latin words: Laus Deo, which means "Praise be to God." The tip is far too high to see from the ground, but a replica is shown inside.

The monument has also been tested by nature. In August 2011, a rare earthquake centred in Virginia shook the region. Cracks opened in the upper stones, and pieces of mortar fell inside. The building closed for repairs, and workers on ropes inspected every face of the shaft. It reopened in 2014. Later, it closed again for several years while the elevator system was replaced. Today, an elevator carries visitors to an observation level near the top.

If you go up, you will need a timed ticket, and it is wise to reserve ahead. From the small windows, the plan of the city becomes clear. To the west, the long Reflecting Pool leads to the Lincoln Memorial. To the east, the Mall runs to the domed United States Capitol. The White House sits to the north, and the Jefferson Memorial stands to the south beside the Tidal Basin. The monument is the pin that holds this cross together.

Back on the ground, take a slow walk around the base. Notice how the stone looks in different light. In the morning it can look pale grey. Late in the day it can turn warm, almost honey-coloured. At night, floodlights make it glow against the dark. On a clear day, the shaft casts a long shadow across the grass, moving like the hand of a giant sundial as the hours pass.

Before you leave, look up once more. Find that faint line where the stone changes colour. Those two shades carry a long story: a dream that ran out of money, a war, decades of waiting, and a country that finally decided to finish what it started. As you walk away across the grass, glance back every few minutes. From almost anywhere in this city, that white line will still be there, standing quietly over everything.