The world's oldest bookshop still in operation.

A kaleidoscopic warehouse-maze of handmade neon signs.

A collection of pianos and more guaranteed to delight anyone interested in music history.

This giant sculpture made of trash is a critique of society's wastefulness.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A beautiful 62-acre Catholic shrine and botanical garden.

Portlandia is the second-largest copper repoussé statue in the United States.

A unique botanical garden housed in three giant geodesic domes.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

Robots, lasers, and whoopee cushions, oh my!

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

Built over an abandoned train yard, this hidden gem is full of winding paths and offers gorgeous views of Sydney Harbour.

Cockatoo Island is a Heritage-listed island in the middle of Sydney Harbour.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

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

A terrific purveyor of natural history objects and curios.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

First planned industrial community in the United States.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Painstakingly built dioramas sit unnoticed in a Boston office building.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

An artsy hidden staircase leads to breathtaking views of San Francisco.