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The Washington Monument is a stone obelisk constructed of 82,000 tons (74,000 tonnes) of stone and standing 550 feet (167 m) high. It is the tallest free-standing masonry structure in the world, and is also the tallest structure in Washington, D.C., not counting radio towers. The load bearing walls are 15 feet (4.5 m) thick at the base and 18 inches (45 cm) thick at the top. Completed more than 125 years ago, it was designed to last for centuries, but even in the time of humans the stone was beginning to deteriorate. How long will it last, in a life after people?

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The Washington Monument is featured in The Capital Threat, starting in 1 day after people, where the show simply says its free from the daily throngs of tourists.

In 1 year after people, the show gave general information being the tallest freestanding masonry structure in the world with the load-bearing walls are 15 feet thick base and 18 inches thick top. Despite it was intended to endure for centuries, in the time of humans, the stone was already beginning to deteriorate. Matt Chalifoux explains the deterioration of the Washington Monument and the cycle of it.

In 500 years after people, the Washington Monument looms over the lush swamp Washington D.C. has become and the stones chipping away with time. Here, it features the monument small aluminum pyramid. Matt Chalifoux explains the brief history of the aluminum pyramid, stating it values more than gold & silver and act as a lightning rod. The show continues its history, with eight copper rods were extended around the pyramid in the 1930s. But 500 years after people, the aluminum pyramid outlasts the corroded copper rods, but it lost its ability to channel lightning bolts. The lightning strikes the Washington Monument at an average of once a year, a long-term threat to the pyramid. And without the ability to channel lightning bolts, the intense heat of the lightning strikes cause part of the top of the Washington Monument and the aluminum pyramid to be covered in soot.

In 1,000 years after people, Washington D.C. has flooded from the Atlantic Ocean, and while the Washington Monument still emerges over the waves, erosion and the ocean are causing the foundation to sink, and submerging is the only chance it has to remain intact. Atop of the sinking stone edifice, the aluminum pyramid is discolored by centuries of weathering, but is still recognizable. Kim Roddis stated that the aluminum pyramid could be the last clearly man-made object left in the capital. The reason why aluminum is still recognizable is because aluminum naturally reacts with the air to produce a protective layer of aluminum oxide, which prevents the metal underneath from reacting with other chemicals. On one side of the pyramid is the inscription "Laus Deo" meaning "praise be to God". As the monument gently descends below the surface of the sea, this inscription could be the United States' final words to the future.

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