A pair of connected skyscrapers form this symbolic gateway.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Tucked away inside this concrete building is a church and its grand display of brutalist architecture.

One man's remarkable private collection of art from around the world.

The best place in the world to buy tinned fish.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This video store is a horror buff's dream.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

This museum promotes informed contraception by documenting its often secret past.

This cubist Vienna church building looks like some sort of alien stonehenge.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

A patchwork of ruins from various civilizations in one of the world's oldest continually inhabited cities.

A monumental underground karstic wonderland is also the water source for over a million citizens of Beirut.

The largest hewn stone in history.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

A marvel of Byzantine engineering under the streets of Istanbul.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

The celebrated eyesore created by starry-eyed sweethearts.

Festival of Perpetual Life and Rebirth.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

A shrine of fire worship built on top of a natural flame.