The beautiful baroque library of the Hapsburg empire.

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.

"Medieval" castle built in the mid-20th century by one family.

Each year melting snow turns these Austrian hiking trails into scuba zones.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Narrow-gauge railway with its own personal power grid.