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

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The most accurate timepiece in the world.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Remnants of a storybook amusement park hidden behind a strip mall.

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.

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

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

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

An astounding collection of medical specimens, including bits of President Lincoln.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

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

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

FDR's Art Deco hospital tower was hopelessly inefficient.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.