This Cambodian riverbed is covered in ancient Hindu carvings both above and below the waters.

Sweden's largest optical telescope sits on a rooftop in Stockholm.

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

A king's bloodstained shirt is among the gruesome collection of artifacts displayed below Stockholm's Royal Palace.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

It houses the remains of a 17th-century version of the Titanic.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Abandoned Nazi train station turned underground astroparticle laboratory.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Week-long block party becomes a competition for the best decorated street.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This Portuguese bullring is built right into the caldera of an island volcano.

An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

This impressive rupestrian engraving dates back to the Upper Palaeolithic period.

An 11th-century medieval castle cascades over the town of Numão.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

Building owners can take out tiles for free at this repository for historic building materials.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

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

This aircraft museum is home to one of just three Halifax bombers in the world.

The little-known second castle that William the Conqueror built in York.

A century-old tradition has culminated in a small but singular collection of feline effigies.