The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Ozymandias’ time-keeping temple.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the largest trees of its kind in California.

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

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Legend says this sacred tree was a gift from goddess Athena.

A sharp sculpture made of thousands of pieces of jagged glass.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

One of the most easily accessible examples of the rare 1960s UFO houses.

Go surfing on this urban wave, "hacked" by local surfers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The location of this historic castle was inspired by a donkey.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Largest lake in Great Britain measured by surface area.