One of the largest underground systems runs under Canada's largest urban center.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

This Toronto garden collects stares and tchotchkes in equal measure.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Once the home of a hermetic monk, this cave now houses a small church.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

This secluded walkway overlooks a magnificently wild London green space.

A network of concealed passageways lies within a busy London Underground station.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

A vintage video game wonderland in downtown Reykjavik.

The exhibition explores the Icelandic city's Viking Age history.

A monument dedicated to the civil uprisings that took place during the Pots and Pans Revolution.

This tiny museum's sizable collection is jammed into a former underground public toilet.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

Like stepping into a spooky fairy-tale, this shop carries the dark ideas of artists and other makers.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

This beach-side arcade is believed to be the oldest penny arcade in America.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.