The world's second-largest sundial, made entirely out of stone.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

Native Americans built this circle of stones, which was used to predict astronomical events.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

A little church on a tiny island looks like something from a fairy tale.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The magical, mossy forest that inspired Princess Mononoke.

This tangled English forest looks like something right out of a fairytale.

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.

Stroll through a wonderland of stupendous moss-covered trees.

The designer of this railway tunnel added a birthday present for himself.

A dark tunnel leads to a striking white crater that seems to be from another planet.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

A luxury hotel housed in a former 15th century Gothic church.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

A marvel of Byzantine engineering under the streets of Istanbul.

During the rainy season, this temple is almost entirely submerged, accessible only by boat.

A Romanesque tower appears when water levels drop.