The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

Over 120,000 curious objects that have shaped our modern world.

One of the few places where you can explore a 1918 paddlewheel steamboat from stem to stern.

A community of collapsing homes more than a mile out from the Florida coast.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

A monument celebrating the idea of reaching inaccessible places.

FDR hoped to find a cure for polio in this Georgia town's warm springs.

North Central Florida's largest flea market and a weekend roadtripper's dream.

Where monkeys run wild and the humans are caged.

The spectacular collection of one of the world's best woodcarvers.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

Three buildings constructed of over 25,000 multicolored glass bottles.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The final resting place of a space program monolith.

Bad farming practices caused this unnatural natural wonder.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The world's only full-size replica of the research hut used by Douglas Mawson for his 1911-14 Australasian Antarctic Expedition.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

This remnant of an old railroad is the tallest surviving wooden trestle bridge in Victoria.

This ancient rock shelter features cave art and is one of the most culturally important sites in the country.

Rare recess caves fill this unbelievably beautiful Ohio park.