The famous artist couple lived and worked here, in two different houses separated by a bridge.

66,000 pieces of art, donated by one of the world's richest men.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Frida Kahlo's childhood home, now a museum of her life and works.

This covert museum showcases booties worn by a rescue dog and slippers owned by Queen Elizabeth II.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

A hoard of sky catalogs, astrophysical journals, even the works of Galileo and Copernicus.

A super-sized promotional trick that is now a D.C. landmark.

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

A rotating cast of guys and dolls in front of a Washington, D.C. building.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

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

A derelict bit of transportation infrastructure hidden in the woods.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

Home to items never before seen by the public.

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

A historic neighborhood church is reborn as a psychedelic arts collective.