The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

This North African stone complex is considered to be the oldest astronomical observatory on Earth.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

A beautiful modern church dedicated to the teleporting patron saint of Andorra.

A group of college students hauled a desk up a mountain more than 40 years ago. The notebooks inside have become a makeshift time capsule.

A doorless and windowless folly in England that evokes curiosity over its mysterious origins.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

An ancient yew tree and holy well nestle beside a remarkable 13th-century church.

These milestones have survived centuries and still mark distances although incorrectly.

A place steeped in history that may be best known as the set of a 1960 film.

Above the door of a house, a plaque claims to commemorate the future living place of the inventor of time travel.

One of the largest private collections of fossils in the world.

Welcome to the home of the world's largest typewriter company.

This French Canadian classic is a specialty of the oldest continually used church in Minneapolis.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

Made from local Irish moss, this pie is served only in Prince Edward Island's potato museum.

A winding staircase that appears to lead to nowhere is actually a diving platform into the Wellington Harbour.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

More than 100 years after his death, the world's largest steer is still attracting crowds.

More than a century old, this trading post resides in the Navajo Nation.

Edison's cast-in-place concrete houses were a failure, but way ahead of their time.

Believed to hold the remains of Japan's most infamous fox spirit, this stone is said to kill those who dare approach.

Local authorities nearly destroyed this mural before a viral video rallied international support to save it.

The ship that got left behind.