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

A small building that loosely resembles a tooth is appropriately used as a dentist office.

One of the best examples of Modernist religious architecture in Mexico City.

The outside of this theater is decorated with a Diego Rivera mural that explores the history of Mexico.

Sample sweets at an Art Nouveau candy shop that's been in business since 1874.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

This amazing collection includes rare stamps from around the world, including fluorescent ones.

A shining treasure trove of fine Mexican silver dating back to the 15th century.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Not quite the menace it once was, this monster still has some chops.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

Meant to be a lavish presidential home, the palace became a symbol of the fall of South Vietnam.

Witnesses claim the Virgin Mary statue outside the church once mysteriously shed a single tear.

This French colonial post office is arguably the grandest in all of Southeast Asia.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

This striking building appears to defy gravity, a tower balancing atop a much smaller cube.

This stately clock was gifted from China's last imperial government to the people of Mexico.