Singapore's landscaping project is home to 18 incredible Supertrees.

Watch butterflies take flight before you fly.

Known as the "Queen of Beach Markets," Calangute epitomizes Goa's beach flea market scene.

An extraordinary "City of Caves" carved from solid stone.

Nineteen ancient rock-cut Buddhist caves can be found on the outskirts of Mumbai.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

Ancient serpentine sacrifice holder that has stood the test of time.

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

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Norway's oldest cathedral still in use.

An impressive museum dedicated to the resource that made the Scandinavian country rich.

Looming communist pillar with a Czech twist.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

The "Prussian Versailles" that is as glorious today as when it was built.

Berlin's old airport.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Cold war icon and onetime "hole" in the iron curtain.

Hamburgers are intensely proud of their tunnel beneath the river.

Fantastic views and thousands of love locks.