Unfortunately, you can no longer spend a night in this single-person treetop hotel.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Heritage tramway linking a Mallorcan town to its port.

Theme park featuring miniature replicas of European monuments.

Climb inside an iron crystal magnified 165 billion times its normal size.

A slice through the original, iconic, rail bridge across the Menai Straights.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

The largest greenhouse in the world is home to over one million types of plants.

Cliffs full of fossils at the portal to England's Jurassic Coast.

The unusual stilted beacon is the town's only active lighthouse.

Museum about life, death, and cannibalism in the Stone Age.

Fascinating town where normal life interfaces with the occult.

This hill and tower are steeped in legend, from King Arthur to the Holy Grail.

The oldest residential street in Europe also features an optical illusion.

A famous pilgrimage site that remains hidden in the midst of a city.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Follow the original medieval paths that wind through this intriguing section of the city.

In 1190 one of the worst anti-Semitic massacres of the Middle Ages took place in a wooden tower which previously occupied this site in York.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.