Eighteenth-century home, where Herschel discovered the planet Uranus.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

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

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

This park feels like a lush little jungle full of wildlife nestled within São Paulo.

This Brazilian palace island was once the site of the last grand ball before revolution.

Solitary monument dedicated to the beauty of nature.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

A museum glorifying the life of Stalin, located in the city of his birth.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

With over 10,000 lights, this engineering marvel lights up the city after dark.

This South Pacific volcano has been blowing its stack for over 800 years and is said to be home to a cult leader waiting to be reborn.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

The sculpture shows a water rat turning the world upside-down, landing an elephant on its head.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

This indoor ski resort has a mountain contained inside a mall.

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.