A brass and marble scale model of the solar system embedded in the concrete.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

When it comes to handsignals (and colonialism) rock always beats scissors.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Vast stretch of tide-pools with a unique Moroccan charm.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

Baltimore's first skyscraper may be home to the inspiration behind pulp fiction's most celebrated bird.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Once America's tallest structure, now a Baltimore landmark.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Wedged between two sets of row houses is an awkwardly located family graveyard.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

A wall of chewing gum moonlights as collective art.

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