A serene desert oasis speckled with ancient artifacts.

A unique botanical garden housed in three giant geodesic domes.

This enormous censer uses a pulley system installed over 400 years ago.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

The largest fountain in Bratislava.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

The Cadillac Ranch for monster truck aficionados.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

It's just another skyscraper, but it's shaped like '90s cell phone.

The language and heritage of a nearly forgotten culture can still be explored in this Southern enclave.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Every week, a festive public jam session breaks out in downtown Asheville.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

Stockholm's tiniest statue is of a small boy looking at the Moon.