A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

This giant wooden treehouse within a sprawling garden has its own eatery.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

The sculpture of the deceased cockatoo flops atop its personal plinth.

An intriguing three-sided folly is a testament to one man's devotion to Catholicism and the number three.

The whimsical twist of this spire was either caused by the Devil, an unexpected virgin, or lead.

Handsomely crafted representations of our round planet.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

Budapest's Communist-era statues, banished to the suburbs.

Once the home of a hermetic monk, this cave now houses a small church.

A once-magnificent collegiate church is falling into ruin.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

Reminders of the Battle of Berlin still scar the railway.

150-year-old satirical tableaus made from stuffed frogs.

Its collection commemorates the author of the iconic children's book "Heidi."

This colossal couch is an unlikely monument to Europe's first female Doctor of Law.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.

A quiet patch of astroturf laid out between a building that seems to be splitting in half.