These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

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

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

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

No one knows who built this strange cave of worship or exactly why.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

The romantic botanic tunnel feels like a well-kept secret.

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