This "floating railway" is one of the world's oldest monorail systems.

Limestone caves with spectacular showcase chambers.

Ghosts of France's colonial past.

A beautiful bamboo trail tucked in this famous Japanese Shrine.

This home is decked out like a psychedelic explosion of colors and bowling balls.

A naturally beautiful, seemingly bottomless deep blue spring.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

This historic stone bridge has an entire neighborhood clinging to its sides.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

Tiki luxury on Nob Hill.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A stunning silver lining to global warming's gloomy cloud.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Megachurch turned Catholic church comprised of 10,000 glass panes.

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

An abandoned vacation home spent a decade taking on legends. It's now taking on water.

The only remnant of a small mining town is an abandoned railroad tunnel that is steeped in ghostly lore.

Lavish royal estate punctuated with heated greenhouses.

Wonderland replication in progress by one persistent man.

This one-time health resort was used by aristocrats around the world.

A part of the world's largest marsh seems to be growing bright red Martian grass.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

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