A museum in the former home of Marxist revolutionary Leon Trotsky.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

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

Where layer cakes tower above one’s head and there is never a shortage of icing.

The only castle in North America to ever house European sovereigns.

Diego Rivera's massive tiled fountain and failed infrastructure project.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Explore the atmospheric ruins of an abandoned convent in the dense forests of Mexico's first national park.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

66,000 pieces of art, donated by one of the world's richest men.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

Part bookstore, part café, and part forest.

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

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

A collection of the best toys ever made, The National Toy Hall of Fame is filled with kids, fun, and for some reason, a bird preserve.

Meet some of the most prominent figures in Black history through life-sized wax models.

An amazing collection of sculptures and art.

This "living building" on Georgia Tech's campus is home to a blueberry orchard, honeybees, and more than 900 solar panels.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

A B.Y.O.B. Mexican cantina lives inside one of the last tortilla factories in Brooklyn.