An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

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

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The revival of a classic Art Deco theater.

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

She stares out across six lanes of traffic, clutching a musket and infant with determination.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

These five Art Deco homes were meant to solve the "small house problem."

The "Sultan of Swat" once attended a school at the site of this baseball field.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

At this former Prohibition speakeasy, electric birds signaled the arrival of hooch.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

Where Kevin Eastman and Peter Laird created their "heroes in a half shell" and founded Mirage Studios.

A real-life hidden Easter Egg in New Hampshire's capital city

A tribute to the truly loyal dog who waited outside a hospital for his owner to come back.

This Connecticut chapel is a starkly modern, and surprisingly colorful, architectural rebel.

In Oklahoma City's Bricktown, there's a street that don't use jelly.

Byzantine emperors ruled, lived, and died in this 13th-century palace-turned-museum.