Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The modern birthplace of Irish freedom.

One of Ireland's most infamous prisons for rebels including men, women and children.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The ancient tomb acts as a calendar that keeps perfect time.

Rivers of cattle blood gone, a strange Escheresque building remains, the last of its kind.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

An enthusiastically interactive mining museum that won't let black lung ruin the fun.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

This elaborate towering structure was once famed for its revolutionary height.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Come for the flowers, stay for the bats!

Tubing through a cave lit with glowworms is a magical underground experience.

Former laboratory of radical psychiatrist Wilhelm Reich.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

After just one epic test blast, this literal loose cannon proved too explosive for combat.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Home to items never before seen by the public.

Opulent downtown movie theater now houses cars as an indoor parking garage.

A Beaux-Arts triumph set to become Ford's innovation campus