Perhaps the most spectacular grotto along the Algarve coastline.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This museum contains a vast array of puppets and marionettes from all over the world, featuring incredible works by Portuguese creators.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

This historic library honors the legacy of the British Empire's first children's librarian.

Willy Wonka would love this weird half-a-home.

A unique collection of Science Fiction, Fantasy, and everything in-between.

Lost subway station nestled beneath Toronto's busy commuter line.

A collection of human remains, animal body parts, and other macabre curiosities all legally for sale.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

This 11th-century temple gave rise to the word "juggernaut," as well as some mysteries that defy scientific explanation.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

There are millions of temples in India, but only one prominent temple dedicated to the Hindu creator god.

An ancient iron pillar in Delhi that seems to be rustproof.

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

The oldest still-inhabited hill fort in India looks like a magnificent golden sandcastle.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

Modest by day, illuminated majestically at sunset.

A blooming house of worship for the masses.

This ancient Hindu temple is covered in thousands of colorful statues and has a long mythological history.

The world's second-largest sundial, made entirely out of stone.