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

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

The longest and widest floating bridge in the world.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A wall of chewing gum moonlights as collective art.

This former coal gasification plant found a curious second life as a popular public park.

A giant Troll lurks under one of Seattle's oldest bridges.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The oldest living cultivated fruit tree in North America.

The lecture hall where Alexander Graham Bell first demonstrated the long-distance phone call.

A throwback train ride transports passengers through one of the lesser-known national parks in the country.

Constructed from the ruins of a former glass factory, this park incorporates the old with the new.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

Go inside the house that inspired L. M. Montgomery to create one of literature's most beloved heroines.

While this is positively the smallest library in Canada, it aspires to be the smallest in the world.

This sprawling collection hides many charms.

This Gothic castle was inspired by Erik the Red's Viking residence at Brattahlid in Greenland.

The roadway bend where highway painters practice their craft looks like expressionist art.

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