This abandoned, windowless concrete block is one of the strangest buildings in Tulsa.

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

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

The best place in the world to buy tinned fish.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

The trials and tribulations of marking Poe’s grave.

Eighty million natural history specimens call this gargantuan museum home.

Repository for more than 22 million pickled specimens.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Sid Vicious famously punched a hole in the wall of this iconic music venue.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

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

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

This one has sailed five times as far as Sir Francis Drake's famous ship.