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

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

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

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

This colonial town in Colombia sits around the largest stone paved square in South America.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

A three-tiered waterfall plummets from a mountain cave with amazing views over the countryside.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

The world's tallest palm trees look like the whimsical kind of plant you'd find in a Dr. Seuss story.

Cathedral carved out of salt, located a mile below the Earth's surface.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

The Andean town where every single building is decorated with a brightly colored frieze.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.