Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This artificial ring island was built to hold cubic tons of polluted dirt.

This imposing tower named after the mythical sword of King Arthur is considered the tallest freestanding climbing wall in the world.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Colorful and chaotic stacked hotel in North Holland.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Structure built from the skulls of vanquished foes.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

The romantic botanic tunnel feels like a well-kept secret.

A small town Romanian cemetery filled with darkly humorous gravestones.

UNESCO-protected ancient burial ground.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Mysterious rocks that ring musically when struck.

A fiery crater has been burning in the Karakum Desert since 1971.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Hot springs monkey spa in the middle of Hell's Valley.

An Australian lake whose pink hue defies scientific explanation.