In Bermuda, this formal naval residence has become a go-to for cliff-jumpers and hikers.

An oddly conical beacon perched atop beautiful Irish cliffs.

A stunning medieval castle owned and restored by the famed actor Jeremy Irons.

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

A museum marks and documents the site of the Titanic's launch.

Northern Ireland's Brobdingnagian stepping stones.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The atmospheric road was never meant to be so creepy.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Historic medieval fortified city in southwest France.

The highest point in Louisiana, Driskill Mountain at 535 feet above sea level.

The highest point in Oklahoma used to be a lawless outlaw's paradise.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

Roaming bison and a spectacular view at the highest point in Nebraska.

This erect, phallic geological spire wasn't always named so domestically.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.

The first declared National Monument in the United States.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

One of America's first dinosaur parks gives a window into Depression-era paleontology.