This ancient Spanish castle sits high upon a hilltop.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The final resting place of soldiers' loyal canine companions.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A controversial memorial at the place where Captain Cook met his violent end.

This blowhole is supposedly caused by a trapped monster.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

The Hudson River School comes alive at this palatial estate.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

This 19th century cyclorama acts like an analogue time machine to a different era.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The haunting ruins of Jack London's dream house.

Dive bar built out of the remains of a whaling ship.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

The highest point in Florida is still the lowest high point in the country.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Mysterious 500-year-old tapestries depict a unicorn hunt.