A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Historic home of a Black veteran of the American Revolution and one of the earliest civil rights activists in the United States.

Five varieties of trees with custom-designed grates around the trunk are planted along the route of the Seattle Transit Tunnel.

Always a new use for this old building.

Over a century old, this restored Victorian building is surrounded by a lush garden filled with rare palms.

A large instrument played by the wind.

A vast city of the dead, where the deceased outnumber the living by more than a million.

The final resting place of the Emperor of the United States and Protector of Mexico.

A lush Seattle garden designed by the same landscape architects responsible for New York's Central Park.

California's largest steel arch bridge.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.

Home to a forest of whimsical pygmy Coast live oak.

A rare tour of a commercial jet assembly plant, held inside one of the largest buildings in the world.

A unique work of automotive art calls this shopping center home.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

The mirrored section takes the shape of Hebrew characters when viewed from above.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.