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

A true treehouse near Hawai'i Volcanoes National Park.

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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Rent a barrel for a personal view of where the Baltic Sea meets the Gulf of Riga.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

This 75-year-old Shakespearean sculpture is painted by a local artist for every season.

A world-class observatory in the California desert.

This Chinese art gallery is hidden inside the Sunrider Corporation headquarters.

The first privately-owned space capsule to orbit and land carried a secret payload: a wheel of Le Brouère.

This former Texas landfill is flush with 300 million-year-old fossils, all fit for the taking.

This enchanting mountain plateau celebrates spooky local folklore.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An unmistakable facial pareidolia in the Julian Alps also includes a fantastic tale.

Exceptional Nepalese food can be found in a Texas gas station.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

These abandoned Cold War-era bunkers are now a designated refuge for endangered bat species.

One of the world's oldest fossil exhibits is on display in a beautiful antique "naturalienkabinett."

The Tübingen University anatomical collection hosts an example of an extremely rare medical phenomenon.

Inside this unique festival hall, a slide leads guests down to a subterranean watering hole.

Featuring Zürich's only authentic 14th-century plague doctor's uniform!

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.