An unusual double-stelae obelisk with ancient and mysterious origins.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

Giant stone letters dedicated to the founder of Armenia's alphabet.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

In this town's main square resides a statue of none other than the 43rd President of the United States.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

After Christopher Columbus died, his son built a fancy house to rule from.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Built in 1512, the oldest cathedral in the Americas.

The final resting place of Christopher Columbus - or possibly someone else.

The first hospital in the New World.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

One of Vietnam's most iconic landmarks was built by Japanese traders and is now in danger of sinking.

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

An ornate tomb pays tribute to one of the most influential and cherished military leaders in Vietnam's history.

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

One of the oldest temples in Ho Chi Minh City, dedicated to a deified Chinese military leader.

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

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