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

A building facade covered with the statues of 11 giants of Tajik literature.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

The rusted creatures wait to be discovered in Prague's botanical garden.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

The oldest Hindu temple complex in Nepal serves as the seat of Nepal’s national deity, Lord Pashupatinath.

A stunning Victorian abbey and walled garden on a lakefront.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

A series of playful yellow penguins share a serious message about the environment.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This once-derelict building is now one of the most beautiful bookstores in the world.

Romania's triumphal arch looks out over Bucharest.

Something's watching you.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A medieval church built up to defend its village.

This snug medieval lane is one of the narrowest streets in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

Sofia's legislative center is continuously reinventing itself.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.