Go inside to really appreciate this 500-year-old technological masterpiece.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A Wild West jailhouse that slid down the mountainside.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

This historic national park is covered in the stunning ruins of red rock pueblos.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

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

An electrical pylon under whose legs a normal gauge train can run.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

These tenacious 14th-century towers defied demolition and are now a fairytale vacation rental.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

Take a walk in a recreation of ancient Rome.

This sprawling Jewish cemetery is one of the largest in Europe.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

A towering monument to war, located on a beautifully peaceful hill.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

One of the most controversial statues in Romania is an emperor with no clothes.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.