These ruins by the Dead Sea is where John the Baptist met his untimely end.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

An ancient underground cultic temple where sunlight penetrates on the summer solstice.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

The only quarter of the Old City not dedicated to a major world religion.

A "miracle" that seems to produce more holy fistfights than holy revelations.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

This family tattoo parlor has been inking religious pilgrims in the Middle East for 700 years.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

A wall of chewing gum moonlights as collective art.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

This massive redwood tree has a hole in the base big enough to drive through.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Stroll through a wonderland of stupendous moss-covered trees.

Only known mainland rookery of the threatened Stellar sea lion.

On the Oregon coast there is a natural hole that seems to be draining the sea.