There’s a special club house at the top for the bell ringers.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Go take a picture with the inventor of the daguerreotype photographic process.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A clone of a cloned tree that was so important it allegedly had its own guards.

The most accurate timepiece in the world.

Perhaps the most scandalous statue of America's first president.

This lovely pocket park is one of the most under appreciated in D.C.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

Obscure Freemasons still live in D.C.’s largest private residence.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Largest Roman Catholic church in North America.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

The most decorated dog of World War I is preserved in the Smithsonian.

The oldest continuously operating fish market in the United States.