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

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

The Golden Dome is the most recognized building on the beautiful campus of the University of Notre Dame

These pretty kitties killed and ate as many as 135 railway workers.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

This impressive gate is the only remaining remnant of a Spanish naval station.

Elaborate series of tunnels where traces of mass suicide are still visible.

A World War II battle site made famous by one man's heroic actions.

One of Japan's most famous sights, the bridge was originally built in 1673.

Once a WWII supply tramway, it's now a popular & steep hiking trail.

Hiding in plane sight.

A small car graveyard sits in the shadow of the famous Cadillac Ranch.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

Its collection includes a broad array of social, geographic, graphic design, and political history.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

This ancient Egyptian obelisk still bears the wounds of World War I.

The bronze uniforms commemorate the vital role of women during World War II.

Giant, friendly pelicans in Central London, the most unlikely of places.