The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

For more than 70 years, this small shop has been a go-to for Kolkata's fountain pen connoisseurs and collectors.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Family-run for more than a century, this pizzeria makes a unique mustard pie.

In the palace with a thousand doors, not all of them are guaranteed to lead you somewhere new.

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

The final resting place for the famed creator and narrator of "The Twilight Zone."

Indents in the pavement are all that remain from a grisly death machine in Paris.

Celebrating the history of Hangul, the Korean writing system invented by King Sejong to improve his realm’s literacy.

The final resting place of New Orleans' most famous voodoo priestess.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

This (occupied) house is 10 feet wide and full of spite.

Across the islands, baked goods, sauces, and much more are for sale 24/7.

The second oldest continuously operating bar in Louisiana.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

Pickles belong on pizza and this freewheeling outpost proves it.

The final resting place of the great navigator, or maybe his brother.

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

This is the oldest Roman-made bridge in the city still existing in its original state.