This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Highly spherical boulders on the shores of New Zealand.

A glacier pocked with ice caves and surrounded by rainforests.

This strange geological landscape erupts with sudden bursts of water.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A Maori village obliterated by an 1886 volcanic eruption.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

This lovely burial mound is actually a replica that was installed after archeologists excavated the original.

A collection of huge Pre-Colombian structures in Alabama.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

Twenty-eight years after this local landmark was washed ashore by hurricane Hugo, it was washed away by hurricane Irma.

One of the oldest living oak trees in the Southeast.

A hillbilly theme park that proved so unpopular the land wouldn't even sell on eBay after it closed.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

This massive roadside mascot was the first version of the giant to illustrate his butt.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

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

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

A particularly disconcerting tribute to Irish martyrs.