From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A beautiful 62-acre Catholic shrine and botanical garden.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

A more chill but no less fascinating version of the famous ancient archeological site.

An ancient capital city that dates back 3,000 years and harbors many surprises.

In Egypt's expanding metro area, many of the neighbors are dead.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Why is there a vintage Rolls Royce in this Buddhist temple?

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.

This ancient cave temple complex is the largest and best-preserved temple complex in Sri Lanka.

This elaborate temple was built around one of the Buddha's teeth.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.