Giant pigeon houses packed into city streets in Egypt.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

These commemorative stones honor a young woman born in captivity.

A pair of black granite tails dive into a sea of grass in landlocked Vermont.

An artist sees trees as a medium for sculpture.

The personal library of the founder of modern neurology is open to visitors.

From Coke II to Google Glass, this exhibit features some of the most spectacular commercial flops.

A library of rare occult books in Los Angeles.

Isaac Newton's former home, where the famous apple tree still stands.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

A beloved street vendor is memorialized outside a German train station.

This medieval fortification has weathered the centuries better than any other structure from its era.

A peculiar idol to the Hindu King of Ghosts demands fine leather footwear in exchange for warding off evil.

Climbing the "mountain of frustration" is no easy feat.

This penny stopped a bullet and saved a soldier’s life during the American Civil War.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

This rare symbol of Eastern philosophy in the West has been created over years of painstaking construction by the local community.

A delightful but little-known public observatory and planetarium in Munich.

This boulder with a 200-word legal dedication to God has remained hidden in the woods for over 150 years.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Stroll through a wonderland of stupendous moss-covered trees.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.