The building's fluid, wavelike walls are a true feat of architectural ingenuity.

They squeal, they nosh, they look like predators.

In paradise, feral pigs have claimed an island all to themselves.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

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.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

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

An ancient capital city that dates back 3,000 years and harbors many surprises.

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

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.

A bright little alley in La Boca is a part of tango history.

This attraction is devoted to the wonders of steam power and features a replica of one of its most public disasters.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Gigantic unfinished stupa and the world's 2nd largest bell.

The oldest teak bridge in the world is made from the remains of a royal palace.

A blooming house of worship for the masses.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The platform atop this verdant volcano was built with the help of a royal elephant.

Handcrafted thermal spa washes away each night with the tide.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Road signs in Namibia mark the location of one of the five major circles of latitude.