The official Presidential Residence of Los Pinos became an emblem of Mexico's opulence and presidential corruption.

This abandoned convent keeps the tomb of a legendary beheaded princess.

A detailed model of Mexico City is the star attraction within this interactive exhibit inside an old theater.

A curious museum of old video game consoles hidden in the back of a store.

Honor one of Argentina's most prolific writers at his historic home.

The incredible private taxidermy collection of an eccentric zoologist.

This lucky bronze frog was gifted to Madrid by a casino.

An archaeological museum at the Aztec pyramid displays signs of the New Fire ritual performed every 52 years.

This small museum tucked within a subway station holds pieces from Madrid's past.

This lonely tower survived the landslide that devastated much of a Mexican mining town.

A colorful "forest" made entirely from three tons of recycled plastic waste.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

An extravagant 18th-century fountain built with bits of broken ceramic.

Detailed miniature models of iconic landmarks in Mexico and around the world.

A network of concealed passageways lies within a busy London Underground station.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

This sculpture garden is a serene oasis wedged in the middle of a busy highway.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

Iconic red and white plaques show the creative names invented to navigate the city streets.

A former factory hosts an amazing collection of Mexican marionettes.

Mexico's largest collection of masks is found in the ruins of an abandoned convent.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Hidden inside a hotel is a museum of miniature models depicting the traditions and history of Mexico.