A massive, cliff-top boulder in Tonga reveals a 7,000-year-old mega tsunami, offering new insights for coastal hazard ...

The hulking rock, called Maka Lahi, is the size of a two-story house and sits on a 120-foot-tall cliff, covered in vegetation ...

Explore the 26 UNESCO World Heritage Sites in the United States, from ancient cultural landmarks to breathtaking national ...

Hundreds of thousands of visitors make their way to Colorado's Mesa Verde National Park. Enjoy ancient cliff dwellings at ...

Walk among ancient Native American cliff dwellings while overlooking an awe-inspiring canyon hidden within Arizona's gorgeous ...

Scientists in Australia have identified the oldest known fossil footprints of a reptile-like animal on a slab of sandstone ...

From ancient cliff dwellings to early 20th-century architecture – and even the place where Pluto was first spotted – this day of history invites you to step through time and experience the ...

Located just east of Flagstaff, Walnut Canyon National Monument offers visitors a rare look into cliff dwellings built ... the site features over 300 ancient dwellings carved into limestone ...

Designated a national monument in 1915 by President Woodrow Wilson, the site features over 300 ancient dwellings ... “There are more than 20 cliff dwellings you can hike to, and many are ...

Yet the ancient inhabitants used game trails as ... While there are no public trails leading to the cliff dwellings across the canyon, the Island Trail promises to take me right alongside a ...

Here are a few of the most prominent ancient underground cities in the world. The Cappadocia region of Turkey is abundant in underground settlements and cliffside dwellings ... overhangs covered most ...