The former headquarters of a leader in the Mexican Revolution, and the site of an often-reproduced image.

An incredible little museum of interior design full of artifacts collected from around the world.

The conquistador's former fortress is the oldest preserved colonial building in the Americas.

Salute the leader of the proletariat.

A reminder to choose water over wine since 1888.

This mysterious marker puzzles pedestrians and infuriates geographers.

Nature and beauty amidst pollution and industrial wreckage.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A meow-velous tribute to a beloved street cat, made famous on the internet.

A marvel of Byzantine engineering under the streets of Istanbul.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.

A historic, century-old house plopped along the perimeter of Houston's ballpark.

An unrealized Taoist palace left abandoned in a Houston suburb.

A little bit Wonkatania, a little bit pink elephant.

A taste of Middle Earth, in the middle of the Bayou City.

A park filled with vibrant mosaics created by more than 300 folk artists.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

There is an unmarked red button hidden over Houston's Buffalo Bayou that is just begging to pushed...

An oddities shop packed with twisted treasures inspired by Oscar Wilde and Edgar Allan Poe.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.