Roman ruins top white travertine terraces formed by ancient hot springs.

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

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

San Diego's most historic and haunted home.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The first declared National Monument in the United States.

Go inside to really appreciate this 500-year-old technological masterpiece.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

The world's largest boar is a huge steel titan found at a French rest stop.

Unusual British home built to disguise a water tower.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

An undulating wicker beast looms peacefully atop a sand dune in Belgium.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

This abandoned Belgian fortress is purposefully being left to nature.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.