Underwater roads undetectable from the surface used for escape routes from foreign invaders.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

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

The Mysterious Witch Bonney, a haunted statue in an old industrial city.

10,000 flowered plants bloom in the City of Roses.

This sandstone mansion was the home of two of Oregon's most important pioneers.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The walls and streets of the ancient city are peppered with penises.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

A museum dedicated to the history of Tokyo's often-overlooked working-class district.

Lithuania's outdoor sculpture trail of wooden folk art.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

The oldest funicular in Lithuania has been climbing this steep hill since 1931.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

The largest permanent Monopoly board makes one of the longest games even bigger.

The headquarters of a secretive order is also a beautifully-designed park.

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

Scary metal statues adorn some of the signature buildings of Burlington, Vermont.

Where a rare geological phenomenon created a section of rock that resembles a checkerboard.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

The 92-foot-tall structure is based on the aircraft that carried the first Americans into space.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...