An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A crumbling ghost town on the South Dakota prairie.

These mosaics were created more than half a millennium ago and feature various animals.

This abandoned but well-preserved Prussian fortress sits abandoned in a Polish forest near the German border.

A short interpretive trail about one of the first human cultures in North America.

In 1914, Archduke Franz Ferdinand spent his final night alive at this luxurious hotel.

One of the world’s most powerful corporations was established on a random Albuquerque street corner.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This oddly shaped boulder in Paris is rumored to be cursed.

Visit a museum dedicated to the “the king of cheeses.”

Fully loaded, Tunisian-style sandwiches are on the menu at this unassuming hole-in-the-wall.

A well-preserved example from a 1920s network of airmail navigation arrows sits near Interstate 15 in southern Nevada.

This ruined castle is said to be the legendary keep of a Viking princess.

This vessel is the final ocean-going paddle steamer in the world.

This girder was hit by a bomb during the Spanish Civil War, but nobody knew about it until 2016.

A tiny museum dedicated to the world’s tallest true giant sits on an island he never set foot on.

In this Romani neighborhood lies a museum dedicated to the culture and history of the Roma.

This imposing castle has stood for nearly a thousand years.

With a design inspired by traditional Latvian textiles, this monument honors the Latvian people who suffered under Soviet occupation.

A free museum that memorializes the deadliest river flood in American history, and the civil engineering efforts to tame the Mississippi River.

A memorial to the murdered Jews of Kaunas.

This Norman church survived the Reformation before suffering 300 years of neglect.

Feast on buckets of garlicky snails.

Beneath this headstone lie the severed body parts of three individuals who were caught up in a bloody period of Scottish history.