This hulking behemoth is actually five interconnected towers built in the 1960s.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

A city block packed with whimsical sculptures that seem to be plucked from a tiled fantasy world.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

This remarkable prehistoric town is full of watchtowers and houses that have withstood thousands of years.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Scientists use one of the saltiest bodies of water on Earth as a terrestrial base for studying water on Mars.

The abstract sandstone rock formations at this Algerian national park are rich with prehistoric art.

A stunning hermit's shrine on a steep rocky spur in Northern Italy.

The vertical-axis windmills of ancient Persia have been grinding flour for 1,000 years and counting.

This Javanese-Hindu temple from the 15th century is unmissable for anyone with even a passing interest in erotic art.

Elaborate patterns adorn the city's disappearing traditional architecture.

The massive white mound and accompanying water terraces are a striking geological oddity.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

Iran's colorful terraces are a rare geological masterpiece.

The underground sanctuary of a mysterious ancient Roman religious cult contains an exquisite traditional fresco.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

In this African village, the walls of the chief's compound are painted with beautiful traditional designs.

Thousands of years of crashing waves gave this mushroom-shaped rock its svelte figure.

These Japanese gardens are blankets of light for dark winter nights.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

This abandoned palace and the stupas around it conceal beautiful Buddhist frescoes, statues, and silk paintings.