This hulking behemoth is actually five interconnected towers built in the 1960s.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This snug medieval lane is one of the narrowest streets in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

This massive underground salt mine now holds a sci-fi theme park in its depths.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

A secret climbing tree hides along the side of a Costa Rican road.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

This wildlife refuge is home to more than 200 species of birds, as well as monkeys, lizards, and other wildlife.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.