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.

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

Art deco landmark on the outskirts of Washington, D.C.

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

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

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

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

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

Home to items never before seen by the public.

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

This statue commemorates the meeting of the most influential minds of the women’s rights movement.

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

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

America's first federal monument.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

This blowhole is supposedly caused by a trapped monster.

Elevated freight railway turned wildly successful urban park.

The fairy tale castle of the "fairy-tale king."

A collection of 20th-century automata, penny arcade games, and musical contraptions.