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

Magnificent New Deal Murals evoke a time when New York City harbor was one of the world's greatest and busiest ports.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

One of the world’s most colorful cemeteries, where each pigment is symbolic.

What was once the largest NFL stadium.

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

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Strange physical sensations and optical contradictions keep visitors coming back for more.

This shallow cave got its name from copious amount of human bones found inside.

The bones of an old zoo crumbling in the shadow of a new one.

Detroit’s downtown castle is one of the oldest structures in the city.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A real flying saucer, contracted by the U.S. Air Force.

A singular collection of hand-built art deco cars are held in a building with style to match.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.