At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

A cluster of granite granaries perched on stilts.

One of the largest Roman settlements in Portugal.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

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

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

The stunning interior of this Gothic church is covered in ornate gold details.

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

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

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.

The world's oldest bookshop still in operation.

Visitors are welcome to enter this lush Key West sanctuary to entertain its plethora of rescued parrots.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A mysterious architectural gem in one of the most elegant areas of Buenos Aires.

An artist's statement of new uses for ordinary and discarded materials.

A pocket of serenity in hectic Buenos Aires, complete with a peaceful courtyard and massive library.

Crumbling crypts and overgrown graves rise just out of arm's reach in this forgotten Buenos Aires graveyard.

This glacier interpretation center houses the world’s only bar made completely from glacial ice.

One family's mission to exemplify sustainability took on a whole new life as a surprisingly beautiful home.

A vibrant street away from the typical tourist track, lined with colorful, mosaic-covered houses.

Mineral springs believed to hold therapeutic properties draw in visitors from all over.

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.