A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

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

Home to items never before seen by the public.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A museum dedicated to exhibiting remarkable outsider art.

The only public swimming pool in Baltimore open to Black Americans during segregation is now a permanent memorial art exhibit.

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

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

A plaque on the base of this statue holds a bewitching design.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

Op-art architecture designed for happiness.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

A bizarre house filled with an astounding array of collections.