New York's oldest and possibly grandest keeper of books.

A living archive of urban activism and space reclaimed.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

A semi-scholarly approach to sex.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

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

A massive Montreal stadium that has seen nothing but trouble since its inception.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

A historic Montreal market that was the city's agricultural hub for over century.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Most-visited and most-photographed slot canyon in the American Southwest.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Rippling sand dunes frozen in the Arizona rock.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A beautiful geyser under environmental threat.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.