After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

An underground city of salt.

Natural rock formations resembling monks in hats inspire folk legends.

The history of the plush toy and South Korea collected under one roof.

Numerical symbolism abound at East Asia's oldest observatory.

A chilling monument to Korean patriots who resisted the Japanese occupation.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

France's most famous cemetery, with some of its most curious tombs.

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

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

One of the largest collections of wildlife art in the United States, built into the side of a cliff in rural Wyoming.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

A bronze plaque marks the site of the only show the "King of the Soul Singers" ever missed.