Oldest existing wire suspension bridge in the United States.

A winding, cliffside stretch of road overlooking the Delaware River.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A pair of 19th-century granite markers symbolically record where the state boundaries of New York, New Jersey, and Pennsylvania intersect.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Three hangars filled with meticulously restored aircraft and armored vehicles.

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

Founded in 1961, this comic shop is said to be the oldest in the world.

A wall of chewing gum moonlights as collective art.

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

An extraordinary collection of aircraft and spacecraft on display at the original site of the Boeing Company.

Toxic waste disaster that founded the Superfund program.

A natural gas leak provides a flickering flame beneath a waterfall.

A reversed traffic signal that was once violently misinterpreted as a statement on British-Irish relations.

Developed by focused shutterbugs, this museum exposes visitors to more than 6,000 different cameras.

The only recreation of William Shakespeare's indoor playhouse.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

A rare venue to buy specialty maps.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

Sip colonial-era cocktails at this monthly recreation of a 1740 watering hole.

This controversial reel is an artifact of the largest fish processing plant in the country, and a symbol of Delaware's integration.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.