This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Perhaps the most spectacular grotto along the Algarve coastline.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A small Portuguese cottage formed between boulders in the countryside.

Houses are tucked between, on, and underneath giant boulders.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

The bizarre story of the mysterious death and hidden treasure of one of Sanibel Island's early homesteaders.

Who is this marble man, perpetually creeping up the steps of his own mausoleum?

This folk art dinosaur was almost pushed to extinction due to lack of a building permit.

A beautiful, creepy 19th-century castle stands incongruous in rural Vermont.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A beautiful, water-filled quarry that has become a popular haunt for swimmers and artists.