Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This shop for all your super spy needs hides an educational secret.

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

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

A nondescript Seattle restaurant inherited a piece of European history.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

This popular bar has been blurring the line between normal and edgy for more than 75 years.

A wall of chewing gum moonlights as collective art.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A giant Troll lurks under one of Seattle's oldest bridges.

A walk through the historic city center, under the streets of Seattle.

One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

Tel Aviv's popular neighborhood went though endless waves of transformation.

A stunning mosque owes its design to an Ottoman ruler nicknamed "the Butcher."

This ancient tomb in the West Bank is a holy site for Jews, Muslims, and Christians alike.

This clock is an architectural flourish that stands out as a landmark among a unique Israeli German community.