This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

The colorful stairs are made with marble from the world's major quarries.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

A museum dedicated to all things tea-related, housed in Hong Kong’s oldest remaining Greek Revival building.

Glass-fronted lifts give riders panoramic views of the skyline and the sensation of floating above Hong Kong.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Paris' linguistic guide to the international language of, yes, love.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

See how aloe goes from field to store and discover the history of aloe cultivation in the Caribbean.

A hugely vast Irish landscape of barren rock that stretches for miles.