Places Donna McColl Wants to Go

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

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

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

A corkscrew-shaped barn in Ireland.

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

Sip a Negroni Sbagliato in the bar that invented it.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A forest outside Darmstadt becomes an open-air art gallery, where international artists turn trees, branches, stones, and clearings into strange, playful, and thought-provoking works.

The Guardian of Tallinn.

This figure was carved in the likeness of a voyeur, so that every time he spied across the street, he would find only himself staring back.

Peek into a cave of giant, glimmering crystals.

One of few vertical lava tubes in the world accessible by foot.

Tubing through a cave lit with glowworms is a magical underground experience.

A subterranean playground in an abandoned slate mine.

One of the few places in the world where visitors can walk alongside fossilized tracks from 80 different dinosaur species.

Tracks of ceratosaurus and Coelophysis rhodesiensis tracks can be found fossilized in the sandstone near Mt. Etjo.