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

Baroque celebration of the end of the Great Plague of Vienna.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

Swedish skyscraper with a 90° twist.

Nordic giants resurrected from the sea and restored to their former greatness.

Twelve sweet, nutty, life-sized statues are housed in this second-story shrine to almond paste.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

This exhibit showcases the literary work of soldiers who suffered "shell shock" during World War I.

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

Beach instrument turned bed and breakfast.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

These azure waters were thought to lead to the Mayan Underworld.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.