Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Bohol's mysterious brown hills.

Ornate limestone building now filled with geologic specimens, and more.

Northern Ireland's Brobdingnagian stepping stones.

The internet as provided by a James Bond villain.

Bizarre Cavern.

A Nesting Doll of Churches.

After Havre burned down, the best place to build was under the ashes.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

A spectacular cave and a beguiling lake.

Stalactites and stalagmites in a beautifully lit cave.

The rocks in this arid basin leave trails of movement behind them.

Mysterious rocks that ring musically when struck.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Olfactory delights in San Francisco's Botanical Gardens.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The Twisted Trees of Alticane are an unnerving grove of Quaking Aspen, apparently mutated from a single source, giving them a twisted and unnatural appearance.

Okinawan dining in a twenty foot tall, man-made tree house overlooking Naha Harbor.

An exquisite tunnel of cascading flowers.

A newspaper editor turned this abandoned island into a tortoise nature preserve that's now the world's smallest national park.

1920's mining camp and environmental education center is serving to protect the surrounding forest, one of the last of its kind in the Pacific Northwest.