Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A fake Transylvanian castle houses a cathedral of antlers.

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 trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

The ancient Greek Titan guards this massive dam holding a lightning bolt to symbolize electricity.

17th century palace once a meeting place for politicians.

This Transylvanian church has changed its denomination four times.

One of the most controversial statues in Romania is an emperor with no clothes.

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

Religious structure known for its sculpted details.

Romania's triumphal arch looks out over Bucharest.

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

Something's watching you.

Gigantic Romanian salt mines used to heal respiratory conditions.

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

This bone-filled cave got its name after they found 140 bear skeletons inside.

The Natural History Museum that time forgot.

Romania's only crater lake with water as pure as if distilled.

A muddy alien landscape that is home to rare species of exotic plants.