This overgrown Illinois water park offers a whole new type of adventure.

Internationally known record store and purveyor of "dusties."

An ode to one of the first concerts broadcast via satellite.

All of Chicago's wood-paved streets are long gone but two alleys remain.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A speakeasy takes on Chicago's drinking culture.

A local landmark with generations of spraypainted messages, and more being added each day.

Go surfing on this urban wave, "hacked" by local surfers.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

This mesmerizingly colorful pond looks like a scene straight out of a fairytale.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

The cave where two British judges hid in exile after sentencing the king to death.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The venerated body of a 12th century saint is celebrated each year with the 'Race of the Candles.'

Contractors in this Oregon town have been stamping their names in sidewalks since 1908.

The walls of the iconic dome are hollow and have a secret stairway.

These abandoned grain silos and tunnels are an urban exploration dream.