Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Depending on the region's rainfall, this church may be partially submerged.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

These temples are among the oldest free-standing stone buildings in the world.

This subterranean necropolis holds three floors of antler-dug grave caves.

This church is named for one of the most dramatic tales in the early Christian church.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

A working miniature city designed to teach kids about safety and presumably city planning.

The former home of the army detachment that captured Geronimo.

Get a taste of Chamorro cuisine, family-style, at this popular restaurant.

This Great Plains museum pays tribute to both the prosperity and tragedy of the North American fur trade.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

These boots are made for selfies.

Three hundred years of preserved Spanish colonial history in San Antonio.

The oldest active mini golf course in the U.S. has an elegant Art Deco style filled with lush tropical plants.

Craggy concrete faces are hidden in the walls of this artificial cave along the San Antonio River.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

The San Marino-Rimini railroad was short-lived but this tunnel once provided shelter for hundreds of refugees during World War II.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.