The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

Renaissance villa and gardens complete with a tormented colossus.

Pompeii's less famous neighbor is still revealing her secrets.

A clock designed to run with perfect accuracy for 10,000 years.

One of the world's largest collections of pathological specimens.

The final resting place to 300 Victorian-era pets hides inside the city park.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Rebuilt remains of a temple to Roman god Mithras.

A white oak with property rights.

This quirky curiosity shop takes its cues from the world's bazaars.

This defunct, fortress-like prison has been the setting for several movies.

A magnificent collection of imperial armor and weaponry.

An IT-specialist-turned-farmer reintroduces an Austrian food tradition while promoting snails as a sustainable "future food" option.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

This cubist Vienna church building looks like some sort of alien stonehenge.

The final resting place for the remains of 143 Habsburg royalty.

Though considered an eyesore by some, this boxy Brutalist high-rise plays a significant role in Sydney's past.

This secret Australian garden was built on love after a man planted a random bulb he found in the ocean.

One of Australia's largest secondhand bookstores.

Australian museum dedicated to human health and lack thereof.