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

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

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

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

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

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

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

This high-design church is made up of two dizzying spirals meant to evoke the weaving together of marriage.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Many of the murals covering this sleepy Florida town hide some sort of intentional error.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A misunderstanding gave this 18th-century racehorse a most amusing name.

This aromatherapy shop and mini-museum cofounded by the Sigur Rós frontman documents Icelandic history through scents.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

A vault of safe-deposit boxes in an old bank has been repurposed as a time capsule of Hispanic culture.

This Parisian café sticks almost exclusively to an ethos of reuse.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

This former coal gasification plant found a curious second life as a popular public park.

This repurposed church offers a more literal way to get closer to the heavens.

Apartment complexes built into huge repurposed natural gas tanks.