More gold than anywhere else, ever.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A technicolor place of worship for Elevationists.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

Surprisingly Delicious Asian-Style Hot Dogs.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The walls of the iconic dome are hollow and have a secret stairway.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

The home of aviation trailblazers, in a remote corner of the big city.

Come for the pastrami, stay for the million-dollar art.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Detailed facade of a brownstone in Boerum Hill.

Ride the subways of yesteryear.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Captain America, Sub-Mariner, and the Human Torch were all born in this art deco Manhattan masterpiece.