This striking art museum holds an amazing series of curiosity cabinets.

The arboretum whose marshy soil sucked up the dreams of housing developers.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Robots, lasers, and whoopee cushions, oh my!

A place to eat for on-the-run agents and espionage enthusiasts.

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

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

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

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

A much-maligned monument to teetotalism.

Where the U.S. government kept its actual treasure, before Fort Knox.

The most accurate timepiece in the world.

A historic ruin just 20 feet away from a busy highway onramp.

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

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

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.