The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

The ruined remains of an early hydroelectric dam.

This massive, ancient stone was disassembled and then put back together again.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

Controversially claiming the title of world's biggest bass drum, UT's Big Bertha was once made radioactive by the Manhattan Project.

Turning night into day in Victorian-era Austin to thwart a serial killer.

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

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

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

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

A museum dedicated to a Cold War era sausage.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

The only arched bridge made of stone on the entire Mississippi River.

When flour explodes, it's not a pretty sight.