This innocent-looking townhome is actually a subway exit.

Detailed facade of a brownstone in Boerum Hill.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

Only hotel where you can legally launder money.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

San Francisco's first World's Fair, dedicated to the wonders of California.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

A hands-on traveling collection of the innovative devices of yesteryear.

A community gathering place that once housed half-ton tanks and the World's Fair.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Try not to get slimed in Tribeca.

The seat of Buffalo government is a gorgeous Art Deco palace.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

One of the largest underground systems runs under Canada's largest urban center.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

Willy Wonka would love this weird half-a-home.

This seemingly cursed monument is dedicated to one of Canada's great war heroes.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Soaring over the Niagara Whirlpool since 1916.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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