Eccentric concrete mansion and museum designed and built by hand from the inside out.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

A rare view of a preserved Victorian science museum.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

The camera-toting gargoyle juts out from the exterior of a Gothic cathedral.

This inn of the court provides a fascinating window into London’s legal and architectural history.

This airport currywurst stand is made out of retro airplane parts.

This coffee shop lies hidden beneath a historic church.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

The remains of an ancient bathhouse sit inside this aptly-named pub.

With over 10,000 lights, this engineering marvel lights up the city after dark.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

Vines grow up the metal bars in this public park created from an old machine factory.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This castle has links to Portugal’s founding and struggles for independence.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

The longest cutting on the M62 contains some surprises—though it's best to leave the motorway to appreciate them.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.