Step inside Lucy, the world's largest "elephant."

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

2300-year-old Roman road connecting the empire.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

A church of bones, decorated with 40,000 human skeletons.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

A fitting attraction for the corn capital of the world.

Home of mutant livestock.

An urban laboratory.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One part antique store, one part curiosities hodge-podge.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.