A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

Ruins of a historic medical facility sits eerily by the water.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

This balancing rock is one of Utah's most unusual geological formations.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

A hidden three-foot-wide house separates these two regal churches.

This giant sculpture made of trash is a critique of society's wastefulness.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

Iron Age runes and ruins hide in plain sight along this Portuguese beach.

A small Portuguese cottage formed between boulders in the countryside.

A replica of the Roman emperor in glorious full color.

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

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

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

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Dead weights honor the dead of Portugal's fishing industry.

On a trail in Portugal's Barão de São João National Forest, a pile of faces look up at hikers from the forest floor.