This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

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

Once the home of a hermetic monk, this cave now houses a small church.

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

Museum dedicated to the terror regimes of Hungary.

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

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

A gorgeous stone viaduct crosses over a bucolic valley.

A cableway for car transport.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

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

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

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

An extraordinary museum devoted to the pop art legend created by Slovak artists.

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

The world's newest astronomical clock is also its most accurate.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.