The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

A unique flight of canal locks that owe their form to 19th-century cost-saving measures.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The world's largest collection of garden gnomes lives among the trees and wildflowers on this woodland reserve.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The eccentric mansion of one the most popular horror authors of modern times.

One of several Lilliputian portals that are ready to transport passengers to other dimensions, if they can find them.

Natural time capsule containing an alien ecosystem.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

400-year-old garden, restored to beauty.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The healing properties of this well attracted royals and commoners throughout the Middle Ages.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Humble beginnings for one of the world's most famous scientists.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.