This secluded walkway overlooks a magnificently wild London green space.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

A little slice of Japan and its aesthetics in London's Holland Park.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Rebuilt remains of a temple to Roman god Mithras.

Banksy gives themself artistic license with this piece of London street art.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

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

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This massive library holds what was once the largest book collection in the world.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Pilgrimage site for star-crossed lovers.

Architectureal fantasy quarter of Rome.

This old medieval prison tower has been a site of astronomical research for more than 250 years.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A submerged archeological park still holds the wonders of a Roman Sodom.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.