A beach made of semi-precious green sand on the Big Island of Hawai'i.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Macabre astrological automaton clock dating to the late 1400s.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

This 13th century Gothic brick castle is the largest in the world by surface area.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A statue honors the children who fought Nazis in Poland.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An abandoned fish-shaped drive-in gets a second life as a restaurant.

Home to a vast collection of The Wizard of Oz memorabilia and the site of an infamous theft.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A toweringly silly piece of modern art has been delighting locals since the 1980s.

Wisconsin's most celebrated export gets the royal treatment on I-94.

This small-town opera house has appeared much more in national culture and history than its charming setting might suggest.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

Its eclectic exhibits range from the world’s first motorcycle to Luke Skywalker’s Land Speeder.