A centuries-old church stands as a testament to Boston's "father of architecture."

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The highest peak in the Jemez Mountains and the traditional center of the Pueblo world.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

This spectacular track has run continuously since 1882.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

Above Breckenridge, a destructive mining technique sits sunken in a small pond.

Isak Heartstone, a 15-foot wooden troll made out of recycled materials.

This open-air reconstruction of an Old West town, a cross between a theme park and a museum, provides an immersive historical experience.

This Rocky Mountain mansion was the luxurious home of the authoritarian leader of a company town.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

Two tall rocks sit at the center of this site, once the home of a large Ancestral Puebloan community.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.