The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

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

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.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This restaurant has been a haven for D.C.'s LGBTQ community since the 1950s.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The highest rapid transit station in the world.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The unassuming structure was part of a Major League Baseball stadium.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Unrepaired walls from a 1920 anarchist bomb attack.

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.