This Mississippi seminary was the first in America to train Black Catholic priests.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

Jail from the 19th century that was built by inmates.

The small first-floor apartment where the author wrote her Pulitzer Prize-winning book 'Gone with the Wind.'

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

The history and future of cannabis.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

Iceland's tribute to its thankless civil servants.

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

Pilgrimage site for star-crossed lovers.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.