This London plaque marks the spot where David Bowie's famous alien made his debut.

A monument stands at one of the starting lines of the Trans-Canada Highway, formerly the longest uninterrupted highway in the world.

Greenery cloaks this serene sculpture inspired by the famous Lost Gardens of Heligan.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

This sculpture forces visitors to confront their relationship with space.

Deep into the lower floors of Pike Place, find a date with fowl fate.

A sliver of nostalgia in Seattle's Viretta Park.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

“Live hard, ride fast, eat pizza” at this joint filled with Evel Knievel memorabilia.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

An enormous, inside-out glass globe built in 1935.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This Parisian gem is one of the most incredible ethnographic museums in the world.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The Sun King's military models, saved from the Louvre.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This bridge was constructed from the rubble of the infamous Bastille.

A mysterious artist-run cabinet of curiosities and library.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.