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

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

Cozy basement bar sports an inventory of over 2,000 beers.

This beautiful, historic church looks like something out of a simpler past.

This private residence was the template for one of the most beloved television homes of all time.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

The beautiful baroque library of the Hapsburg empire.

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

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

A battle between nature and architecture in the Cambodian jungle.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

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

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

Scary metal statues adorn some of the signature buildings of Burlington, Vermont.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.