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

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

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

A Romanian church built from one single oak.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

Gigantic Romanian salt mines used to heal respiratory conditions.

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

This once-derelict building is now one of the most beautiful bookstores in the world.

Moss and stone turn this waterfall into an otherworldly liquid veil.

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

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

A giant portrait of an ancient king looms over the river.

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

Art and a pun, all in one.

A portable, wooden replica (minus the hyphen) of Hamburg’s iconic crooked coffee shop.

When German-Iraqi relations broke down, this embassy was vacated post haste.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Reminders of the Battle of Berlin still scar the railway.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

These Bronze Age rock carvings are among the oldest in the region.

The world's only above water sand volcano, believed to once be the bathtub of a priest.