Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

Created as a "model concentration camp" to hide Nazi atrocities from the international community, this former camp-ghetto now holds a museum and memorial honoring the lives lost within.

Named after the German word for "a longingness to travel," this park brings together thousands of city and street signs from around the world.

During the 19th-century, this park was a vital trading fort.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

This sculpture forces visitors to confront their relationship with space.

An ancient fortification lives on in this Chinese city.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

A secluded, little-known temple hidden amid the dense jungle.

Eat your Big Mac in a DC-3.

One of the world's earliest skyscrapers.

Although resembling a grand Buddhist temple, this structure is actually the largest mosque in China.

An eerie reminder to the horrors of World War II.

A centuries-old copper mine that once provided two thirds of the world's copper supply.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

This 13th century Gothic brick castle is the largest in the world by surface area.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

This public elevator links the lower city to the upper city of Salvador.

The reconstruction of this prominent building fulfilled a long-written command.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.