The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This overlooked, beautiful convent hides an original Hieronymus Bosch among its many treasures.

Quito's historic, main square dates back to the 16th century.

The gondolas let you glimpse a bird's-eye view of one of the world's highest capital cities.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The fight to make Bengali an official language started in this stunning university hall.

All that is left of an Armenian community that thrived in Dhaka 200 years ago.

The untimely death of a dignitary's daughter led to this fort being abandoned before it was ever finished.

A tiny mosque decorated with mosaics using an early form of recycling.

This colorful palace is an oasis of calm amid the hustle and bustle of the Buriganga riverfront.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

A celebration of Colombia’s premier contemporary artist.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

Towering high above the neighborhood of La Candelaria, the church is easily recognizable by its distinctive red-and-white striped facade.