In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

The first steel dam in the world and the only one still functional in the United States.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

A sharp bend in a dramatic river canyon cut through red rocks.

Most-visited and most-photographed slot canyon in the American Southwest.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

An artist's cute bronze subway sculptures belie his violent artistic past.

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

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A swaggering, monumental souvenir of the most extravagant party Montreal’s ever thrown.

A historic Montreal market that was the city's agricultural hub for over century.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

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