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

Building owners can take out tiles for free at this repository for historic building materials.

The stunning interior of this Gothic church is covered in ornate gold details.

A hidden three-foot-wide house separates these two regal churches.

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

Ancient catacombs form the foundation for this Rococo orgy of a church.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The oldest house in Galena, Illinois, now is a reminder of when this city was the world's lead mining capital.

A terrific purveyor of natural history objects and curios.

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

Museum dedicated to the art of cutting and polishing stones.

The only arched bridge made of stone on the entire Mississippi River.

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

20,000 pieces in a Frank Gehry-designed building.

This working class sculpture pounds his hammer all the livelong day.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A walk through the historic city center, under the streets of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

More than 5,000 contemporary and "historic" mustards from around the world.

World's second largest particle accelerator, where nature reveals its secrets.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.