Outsider art meets paleontology at this roadside reptile repository.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

Years of archaeology, just chillin' by the water cooler.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

A medical facility that has been kept frozen in time.

This mysterious hill seems to pull objects uphill.

The largest retailer of seashells in the world.

Former utopian colony based on the belief that the universe exists in a hollow sphere.

Just below the surface, shrimp are producing temperatures hotter than the sun.

This kitsch eatery is chock-a-block with bric-a-brac.

In a city crazy for seashells this museum educates and amazes visitors using the wonder of cast-off exoskeletons.

One man's fulfilled dream of living on an artificial island made of recycled plastic bottles.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

A flooded Mexican cave that hides a river beneath the water.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

These azure waters were thought to lead to the Mayan Underworld.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

A museum celebrating the Victorian obsession with hair art.