A 30-acre garden inspired by the principles of modern physics.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

These fantastically named natural pools look like something out of a Scottish myth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The amazing wonder cabinets of a very rich Austrian archbishop.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

"World machine" built by an untrained Austrian farmer.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Fantastic stories on a miniature railroad.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Double spiral staircases are not unheard of, but they are very rare.

The unusual sculptures are believed to be powerful political symbols.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

An abandoned monument remembering the "Pančevo Holocaust" now stands as a shadow of its former self.

Curious carved stones and bird-like wings are a symbol of Serbian resilience and freedom on the site of a WWII massacre.

Abstract monuments express sorrow and resilience at the site of a horrific massacre in Nazi-occupied Serbia.

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

Religious perseverance and cultural coexistence manifest in an architectural gem that multiple wars couldn't topple.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

A pair of connected skyscrapers form this symbolic gateway.