Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

Giant pigeon houses packed into city streets in Egypt.

Brightly painted boulders scattered throughout the Sinai Desert.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Ozymandias’ time-keeping temple.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

Colorful and chaotic stacked hotel in North Holland.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This unattributed sculpture in Amsterdam is hiding in plain sight.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The attic of a four-century-old canal house hides a clandestine church.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A beautifully eclectic mix of architectural styles.

Amsterdam's Red Light District leaves little to the imagination.

The history and future of cannabis.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

100 year tradition of fist fights, marked by marble footsteps.

Tiny Swedish village with a distinct local phenomenon known as an "Elk Shower."