A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

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

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

This mesmerizing kinetic sculpture blossoms endlessly in the breeze.

Hans Christian Andersen for the postmodern world.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Macabre astrological automaton clock dating to the late 1400s.

The most visited, and possibly most controversial, museum in Germany.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

360° views of the city plus five floors of optical illusions and hands-on science.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This small chapel is built of human bones and decorated with a golden skeleton.