Costa Rica's best known combat zone, used during the Battle of Santa Rosa.

This abandoned hospital is one of the most haunted places in Costa Rica.

Military artifacts from the Salvadoran Civil War are displayed in this small but notable museum.

This color-changing crater lake in El Salvador is occasionally impenetrable to sunlight.

This historic Mexican convent is home to a tree that grows crucifix-like thorns.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

This archeological site hidden behind Teotihuacán's pyramids shelters 1600-year-old murals.

In Coyoacán, a pair of coyotes crown a public fountain in reference to the ancient Aztec name of the borough.

A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

This Ottoman bridge is a rare covered bridge with shops, and considers itself the only bazaar bridge in the world.

The largest hewn stone in history.

Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

Charnel house at the foot of Mount Sinai.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The oldest tourist graffiti in the world helped archaeologists identify the Pyramid of Djoser.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

In Egypt's expanding metro area, many of the neighbors are dead.

Source for a sizable portion of Egypt's freshwater supply is more than an optical illusion.

The world's largest ship graveyard is the product of decades of corruption.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

This vast masterpiece of Moroccan architecture spreads across 20 acres.