A striking 12th-century-style castle built on the edge of a cliff.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This massive redwood tree has a hole in the base big enough to drive through.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A wall of chewing gum moonlights as collective art.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Quite simply the largest tree in the world (by volume).

All that remains of a Japanese fishing vessel that ran aground in 1982.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

Three columns of volcanic rock shoot out of the ocean.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

A hot dog stand where the heads are just as hot as the dogs.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

Former meatpacking facility turned vertical farm and sustainable business complex.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This stunning concert hall has become a symbol of Iceland's national recovery.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

An encyclopedic collection of mammal penises.