A Bibliophile's Dream.

One of the oldest Christian churches still standing in the Americas, and almost certainly Mexico's oldest in continuous use.

This scenic cable car ride glides 100 feet above Mexico City.

These biodiverse university gardens form a green oasis amid the urban chaos of Mexico City.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

Frida Kahlo's childhood home, now a museum of her life and works.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Former villa and estate of James Deering developed to preserve native tropical forests.

Over 120,000 curious objects that have shaped our modern world.

Eighteen miniature death-scene dioramas.

Once America's tallest structure, now a Baltimore landmark.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

“Invented in Key West, Perfected in Brooklyn."

A local prank turned town icon.

This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

A cluttered and astounding collection of antiquities and curiosities.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

The London statue that imitates passersby.

Catacombs turned marketplace.

The Tudor-style cottage in the middle of the square is not quite what it seems.