One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

This subterranean funicular is one of the world's smallest subways.

The only quarter of the Old City not dedicated to a major world religion.

This full-sized orange tree lives suspended in mid-air above the streets of Jaffa.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

Palace where the nearly un-killable Rasputin was murdered.

Its front wall is striped with a menagerie of fantastic beasts and magnificent monsters.

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

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Giant stone letters dedicated to the founder of Armenia's alphabet.

Men and special assistants stand by the road to sell the day's catch in this lakeside village.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

Remnants of successive wars and Muslim colonialism in the 11th century.

An abused and forgotten metropolis, abandoned for centuries.