This former Soviet military base has over 10 original aircraft and an enormous amount of memorabilia on display.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.

Along this stretch of beach in Denmark resides several massive bastions of energy.

A sobering museum dedicated to landmines and the personnel working to remove them from Afghanistan.

An 11th-century mountaintop fortress that played a crucial role in Italy's papal wars is now a vacation rental.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

The final resting place of one of the most influential modern occultists.

One of the most valuable palace-garden complexes in the eastern borderlands—and one of the most haunted.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

These medieval monastery ruins are surprisingly overlooked by most tourists.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A small island with no monkeys but plenty of military ruins.

A cave's rare beauty held a cavernous secret hidden underground.