The eccentric mansion of one of the most popular horror authors of modern times.

A performance hall at the American Jewish University moonlights as a sci-fi film location set.

The oldest still-existing mosque in the United States sits in a remote prairie in North Dakota.

P-town goes wild for the malassadas at this 87-year-old institution.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

A mysterious concrete hand reaches out from between the stones of Uniwersytecki bridge.

This gravity-defying rock formation is one of Big Bend’s natural wonders.

The abstract sandstone rock formations at this Algerian national park are rich with prehistoric art.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

The writing studio of an American adventure author, built in the style of a medieval castle.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

An unlikely neo-Gothic castle in the Paraguayan countryside.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

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

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

All that remains of a 16th-century Jesuit school is this carved, worn gate.

An abandoned castle owned and ignored by Masons carries a cursed history.

Al Rahmah Mosque appears to "float" atop the Red Sea.