These eerie outliers of the lightning bug family glow a mysterious blue color.

This former sugarcane transport tunnel is now a portal to a lovely beach.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

This stone complex marks the urban center of a lost civilization.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

This winding road through an Italian canyon may be the most scenic drive in the world.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.

These haunting ruins belong to an ancient village that once had one hell of a view.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

A complicated, forgotten beacon of hope for thousands of immigrants, "Canada's Emerald Isle" lies in ruin.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

Warsaw's fantastically preserved gasworks...almost.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

A magnificent, iconic stone tower in the Scottish Highlands.

This elegant arc of a waterfall marks a religious turning point.

This enchanting rainforest hotel looks as though it grew from the forest itself.

Leave the wardrobes and sweets to British schoolchildren, Shanghai's got a Coke machine that leads to booze.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

Dr. Strangelove-esque tours reveal the inside a bunker once reserved for Stalin himself.

Four hundred granite steps were built into this massive rock by the National Park Service.

This natural sea cave hides a small wonderland of natural turquoise beauty.