A large portion of this navigable canal runs under Paris's famed boulevards.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

One of Jeff Koons’s largest sculptures and his first commemorative work.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

A historic structure inspired by Roman, Muslim, and Jewish bath houses.

Designed by Gustave Eiffel before his famed tower.

The world's largest wooden structure.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

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

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

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

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

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

These elaborate gothic monuments honor Verona's medieval lords.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Pilgrimage site for star-crossed lovers.

A Japanese video game arcade hides in the back of a Swedish pool hall.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

The world's northernmost ice hotel.

At this Arctic outpost, get to know members of the indigenous Sámi community and meet their herds.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

The unexpectedly beloved remnants of a controversial thermal power plant.

Week-long block party becomes a competition for the best decorated street.