A marvel of Byzantine engineering under the streets of Istanbul.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.

A ghost village sits atop a mountain within Jordan’s largest biosphere reserve.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

A more chill but no less fascinating version of the famous ancient archeological site.

These markers are used to determine the ground stability of the Strip.

This statue of the famed author, actor, and journalist is made entirely of screw-nuts.

A collection of mechanical beasts with some interesting names.

This communist country can still appreciate its fragrant past.

The figure atop this globe is from a Serbian play about a merchant's travels around the world.

Dedicated to one of the pioneers of Serbian football.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

One of the last designs from architect Oscar Niemeyer.

This Buddhist temple is home to a number of towering statues spread over a peaceful wooded park.

A deep toxic lake fills this abandoned open-pit copper mine, now a Superfund site.

This structure, built more than 60 years ago to manage devastating seasonal floods, is known to attract a rare species of freshwater dolphin.

The father of Belfast medicine is buried in the graveyard of this 13th-century church, which now lies in ruins.

This authentic Fijian restaurant helps farmers and fishermen recover from natural disaster.

Now in ruins, this abbey was the home of Tironensian monks for more than 400 years.

A renovated hotel is bringing new life to a nearly-abandoned mining town in Colorado.

A 2,000-year-old Iron Age fort offers stunning ocean views.

This hiking/biking/horse trail along an old railroad grade features trestles, tunnels, and a roadless stretch through the scenic Susan River canyon.

In Little Caribbean, an ice-cream shop serves up regional flavors, including soursop, Irish moss, and "greatnut."