This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

Romania's triumphal arch looks out over Bucharest.

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

A whimsical bridge adorned with decorative dragons.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Go inside to really appreciate this 500-year-old technological masterpiece.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A six-ton wedding present for the King of the Scots.

The celebrated eyesore created by starry-eyed sweethearts.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The magic's in the hole!

Leave a button on the jacket of this iconic Seattle clown.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This iconic science fiction house still looks like something from the future.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Millions of numbers carved in glass represent the tattoos forced upon victims.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.