A cheeky architectural easter egg.

A perfectly preserved hill village where the buildings are painted like white lace.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Dedicated to the unsung history of human waste.

This peculiar border irregularity is the only way to legally enter Russia without a visa.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

A narrow strip of land is home to the tallest migrating dunes in Europe.

Remains of the old fortification along the Western border of the USSR, now an elaborate defense museum.

An unusual cave filled with rare alien-looking aragonite formations.

A unique hotel for the artistic soul.

An industrial site turned into Hungary's most cherished natural wonder.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

After 11 years of reconstruction work, Slovakia's finest hilltop chapel complex is finally reopen to the public.

This vast, water-filled underground labyrinth can only be toured by boat.

Artfully arranged bones of 5,800 Austrians.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

This hanging crocodile is thought to be the "dragon" that once plagued a Czech city.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.