Few of the many visitors to this resort town know of its hidden Maya ruins.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

This city's cultural center is in a restored Spanish colonial home from the 1800s.

A massive underwater sinkhole made famous by Jacques Cousteau.

These roaring primates were considered a divine creature in the cosmology of the Maya.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Thousands of flowers create enchanting pink tunnels over the city streets.

Fantastic views and thousands of love locks.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

Liechtenstein's royal family calls this medieval alpine castle home.

If you ever wanted to touch a medieval mercenary’s three testicles, look no further.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

A fortress off the West coast of Portugal that dates back to 1502.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

This "floating railway" is one of the world's oldest monorail systems.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

An electrical pylon under whose legs a normal gauge train can run.

Twisted buildings adorn the banks of the Rhine river.

This futuristic German television spire is actually the world's largest digital clock.