The house where John Wilkes Booth conspired with his co-conspirators.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The "lovely red Vega" of the legendary record-settling pilot.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

A museum dedicated to man's boldest venture.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

Take a drunken tour inside the world's largest known geode.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.