The most important and best preserved remnant of West Africa's powerful Songhai Empire.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Mausoleum and Holy Seat of Antiochus I of Commagene.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

Step back in time and witness the fall of Constantinople.

This famous city eluded concrete detection until the early 2000's.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

Once in disrepair, the house where the 1983 film was shot has been restored and turned into a museum.

The hero of the women's suffrage movement birth home is now a museum dedicated to her legacy.

This famous church is adorned by a mural commemorating the independence of Vatican City.

Time travel with sweets across history at this research-based candy store.

An important piece of history from mankind's journey to the moon sits in the lobby of a government science lab.

Tools, pottery, and mummies showcase the history of La Palma's native people.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

This remote desert watering hole has a connection to a curious chapter of American history.

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

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

You can explore the halls of tombs in the abandoned former capital of the Zapotecs.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

This museum explores the lives of Chang and Eng, the "Original Siamese Twins."

This 18th-century former mosque held the first Hellenic Parliament.

Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

The Route 66 institution that inspired Taco Bell also served as an important headquarters for Mexican-American social movements.