D.C. once had its own tiny rival to the New York Stock Exchange.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

A super-sized promotional trick that is now a D.C. landmark.

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

A haunting tribute to pioneering photographer Clover Adams.

The walls of the iconic dome are hollow and have a secret stairway.

A nostalgic bibliographic gem.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The United States Capitol's former columns still stand.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A brick-paved former section of the historic coast-to-coast highway.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A "haunted" landmark on the coast of Southern California.

This enormous World War II relic is one of the largest wooden structures in the world.

The only rotating bar in New Orleans has been slowly spinning since 1949.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

At HopCat, a marker honors fictional creatures with the ability to travel the missing dimensions of Kcymaerxthaere.

The only quarter of the Old City not dedicated to a major world religion.