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

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

This enormous spiral sculpture looks strangely out of place on the edge of a housing development.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

An architectural oddity of six stories, accessed by graceful ramps.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

A corkscrew-shaped barn in Ireland.

The ancient tomb acts as a calendar that keeps perfect time.

A spiral staircase twists to the top of this unusual Czech lookout tower.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A maze of underground tunnels beneath one of the most beautiful forts in Serbia.

Beautifully carved tombstones fill this unmarked graveyard, uniquely situated near the village's famous stone wine cellars.

This symbol of Yugoslav liberation decorated with 620 carved heads of mythical creatures is now a forlorn relic of another time.

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.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

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

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

A Serbian church lit by chandeliers made of weapons.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.