Something's watching you.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

Romania's triumphal arch looks out over Bucharest.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

Huge stairway leads to this massive gallery.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

This family tattoo parlor has been inking religious pilgrims in the Middle East for 700 years.

Two innocuous monuments found in separate locations attempt to unite a city.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Sip cherry liqueur at a bar dating back to 1840.

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.

The world's oldest bookshop still in operation.

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

A pair of gigantic baby heads greet passengers at Atocha Station.

A lush indoor jungle fills this bustling Madrid transportation hub.

Looming communist pillar with a Czech twist.

Macabre astrological automaton clock dating to the late 1400s.

A surreal statue honoring Prague's favorite literary son.