Ballymalis Castle is a tower house and National Monument located in County Kerry, Ireland.
Devils Postpile National Monument is located near Mammoth Mountain in eastern California.
 The national monument protects Devils Postpile, an unusual rock formation of columnar basalt.
 Devils Postpile National Monument encompasses 798 acres and includes two main tourist attractions: the Devils Postpile formation and Rainbow Falls, a waterfall on the Middle Fork of the San Joaquin River.
 In addition, the John Muir Trail and Pacific Crest Trail merge into one trail as they pass through the monument.
 Excluding a small developed area containing the monument headquarters, visitor center and a campground; the National Monument lies within the borders of the Ansel Adams Wilderness.
The California Coastal National Monument is located along the entire coastline of the U.S. state of California.
 This monument ensures the protection of all islets, reefs and rock outcroppings along the coast of California within 12 nmi of shore along the entire 1100 mi long California coastline.
 Conservative estimates are for at least 20,000 such outcroppings.
 The monument was created by Presidential proclamation on January 11, 2000 with the authority in section two of the Antiquities Act of 1906.
 s of 2014 , the monument has expanded to 2272 acres .
 It is managed by the U.S. Bureau of Land Management, an agency of the U.S. Department of the Interior.
 There are five regulated gateways in which the monument can be accessed; the Trinidad Gateway, Point Arena Gateway, Pigeon Point Gateway, Piedras Balncas-San Simeon Gateway, and Palos Verdes Peninsula Gateway.
 The California Coastal National Monument is one of the most-viewed national monuments in California although people are usually not aware that they are viewing a national monument.
Fossil Butte National Monument is a United States National Monument managed by the National Park Service, located 15 mi west of Kemmerer, Wyoming, United States.
 It centers on an extraordinary assemblage of Eocene Epoch (56 to 34 million years ago) animal and plant fossils associated with Fossil Lake—the smallest lake of the three great lakes which were then present in what are now Wyoming, Utah, and Colorado.
 The other two lakes were Lake Gosiute and Lake Uinta.
 Fossil Butte National Monument was established as a national monument on October 23, 1972.
Pipe Spring National Monument is a United States National Monument located in the U.S. state of Arizona, rich with American Indian, early explorer, and Mormon pioneer history.
 Administered by the National Park Service, Pipe Spring was listed on the National Register of Historic Places on October 15, 1966, and the boundaries of the Pipe Spring National Monument Historic District (a portion of the monument) were expanded in October 2000.
The Reconstruction Era National Monument is a United States National Monument in Beaufort County, South Carolina established by President Barack Obama in January 2017 to preserve and commemorate activities during the Reconstruction Era that followed the American Civil War.
 The monument is the first national monument dedicated to the Reconstruction era.
 It is administered by the National Park Service.
Mojave Trails National Monument is a U.S. National Monument located in the state of California between Interstates 15 and 40.
 It partially surrounds the Mojave National Preserve.
 The focal point of the new preserve is the remote and nearly pristine Cadiz Dunes that formed from the sand of dry lake beds.
 It was designated by President Obama on February 12, 2016 along with Castle Mountains National Monument and Sand to Snow National Monument.
 It is under the control of the Bureau of Land Management.
Gila Cliff Dwellings National Monument is a U.S. National Monument created to protect Mogollon cliff dwellings in the Gila Wilderness on the headwaters of the Gila River in southwest New Mexico.
 The 533 acre national monument was established by President Theodore Roosevelt through executive proclamation on November 16, 1907.
 It is located in the extreme southern portion of Catron County.
 Visitors can access the Monument by traveling northbound from Silver City, New Mexico approximately 37 miles on NM 15.
Canyons of the Ancients National Monument is a national monument protecting an archaeologically-significant landscape located in the southwestern region of the U.S. state of Colorado.
 The monument's 176,056 acre are managed by the Bureau of Land Management, as directed in the Presidential proclamation which created the site on June 9, 2000.
 Canyons of the Ancients National Monument is part of the National Landscape Conservation System, better known as the National Conservation Lands.
 This system comprises 32 million acres managed by the Bureau of Land Management to conserve, protect, and restore these nationally significant landscapes recognized for their outstanding cultural, ecological, and scientific values.
 Canyons of the Ancients encompasses and surrounds three of the four separate sections of Hovenweep National Monument, which is administered by the National Park Service.
 The monument was proclaimed in order to preserve the largest concentration of archaeological sites in the United States, primarily Ancestral Puebloan ruins.
 As of 2005, over 6,000 individual archeological sites had been identified within the monument.
The tower house (Irish: "caisleán" ) appeared in Great Britain and Ireland starting from the High Middle Ages.

Question: In what county is a structure, known in Irish as a "caislean" and regarded as a National Monument, located?
Answer: County Kerry, Ireland