A limestone wonderland of water and subterranean secrets.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

A walkable map of the world, made from soil and stone by one man.

An abandoned whaling station on an active volcano offers hot springs in Antarctica, surrounded by ruined giants of industry.

One man's swirling six-acre monument of stone.

This frequently-photographed waterfall takes only a short hike to visit.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

An intricate and amazing house built by architect Karl Junker.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

This massive redwood tree has a hole in the base big enough to drive through.

The tallest stationary dunes on Earth also happen to sing.

A dangling church built over a Colombian gorge.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Intensely colorful calcite pools in Southern China.

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

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

European castle ruins in an American state park are actually the product of death and grief.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Quite simply the largest tree in the world (by volume).

A canvas of crops grow from vibrant red soil in this terraced farmland.