Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

San Francisco's newly reopened hands-on science museum.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A walk through the historic city center, under the streets of Seattle.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

An impressive monument to Poland's independence.

Museum dedicated to "the man who moved the Earth."

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Relive a Polish uprising via an enormous, century-old cyclorama.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Naturally formed rock city in Poland.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.