An abused and forgotten metropolis, abandoned for centuries.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

The last of its kind in the country.

A treasure hunter's tiny bar, harboring celebrities since 1959.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A cluttered and astounding collection of antiquities and curiosities.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

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

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

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

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A 400-square foot model of historic Quebec is the playing field for a state of the art light and sound show.

World's second largest particle accelerator, where nature reveals its secrets.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.