From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Medicinal spa created with the discharge from a geothermal energy plant.

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

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.

Peace Park and the Atomic Bomb Dome.

Japanese national treasure originally built in 593 CE.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The 10,000 Torii shrine.

The site of the most dived wreck in the UK.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Giant statue of a disembodied head.

19th century tunnels burrowed under Liverpool.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

Pyramid shaped monument with a tall tale attached.

Abandoned ship reimagined as a street art canvas.