This historic spot was where America's involvement in the Vietnam War officially came to an end.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

A marvel of Byzantine engineering under the streets of Istanbul.

The former hotel where Tesla invented the radio.

This park is home to a massive bird sanctuary. And maybe buried treasure!

The last vessel built by a submarine pioneer stands as a monument to his legacy.

Old Danish castle immortalized in Shakespeare's Hamlet.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

Ottoman-era houses lovingly preserved.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Bridge that died in war and was resurected.

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

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Designed by Gustave Eiffel before his famed tower.

From Carthage's Hannibal to riders of the Tour de France, many have crossed this scenic route through the Alps.

A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

Perhaps the most spectacular grotto along the Algarve coastline.

A unique seaside cave where Aleister Crowley faked his own death.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

This unreal Portuguese palace looks as though it's made from a pile of different castles.