A large collection of motorbikes with some impressive gems.

The largest ancient burial mound in Ohio.

What is it about mushrooms that makes people wish they lived inside of them?

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

Georges Seurat’s pointillist masterpiece has been recreated in Ohio in topiary form.

Take a drunken tour inside the world's largest known geode.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A unique seaside cave where Aleister Crowley faked his own death.

This small chapel is built of human bones and decorated with a golden skeleton.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This abandoned five-star hotel is now a five-star urban exploration destination.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Founded in 670, this ancient mosque is an architectural time portal.

An ancient burial ground believed to have been used for ritual sacrifice.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

A mud brick kasbah with a history of lavishness and traitorship.

The largest cactus farm in Africa.

The true depths of these stunning Moroccan caves are unknown.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.