An unusual and powerful memorial in which earthquake victims are remembered by empty white chairs.

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

The world's only complete colossal squid specimen is on display at the Te Papa Museum.

The anatomical-pathological collection of a man who changed surgery.

A cluttered and astounding collection of antiquities and curiosities.

A naturally mummified 2,000-year-old man.

Giant, friendly pelicans in Central London, the most unlikely of places.

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

Catacombs turned marketplace.

Hear the quietest sound from across the dome.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The site of the climactic scene from the classic horror film is now a historic landmark.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A super-sized promotional trick that is now a D.C. landmark.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

The most playful of the life-sized statues that make up Singapore's "People of the River."

A licentious look into Singapore's past, full of disorderly bric-a-brac and disreputable characters.

Macabre astrological automaton clock dating to the late 1400s.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

A yoga studio and venue for "chill-out parties" in a former chicken slaughterhouse.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A church of bones, decorated with 40,000 human skeletons.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.