5 Sights in Montgomery County, United States (with Map and Images)

Bowstring Truss Bridge, also known as the Roaring Run Bowstring Truss Bridge and King Tubular Arch Truss Bridge, is a historic bowstring truss bridge located at the Ironto Rest Area near Ironto, Montgomery County, Virginia. It was built by the King Bridge Company in 1878, and is a single-span, four-panel tubular arch pony truss. It measures 55 feet (17 m) long, 12 feet (3.7 m) wide, and 6 feet 6 inches (1.98 m) high with an open roadway width of approximately 9 feet 6 inches (2.90 m). The bridge was partially disassembled and moved from its original location to a second site during the 1930s, where it remained until moved to its current location in 1977.

Wikipedia: Bowstring Truss Bridge (Ironto, Virginia) (EN)

Graham Cave is a Native American archeological site near Mineola, Missouri in Montgomery County in the hills above the Loutre River. It is located in the 356 acre Graham Cave State Park. The entrance of the sandstone cave forms a broad arch 120 feet (37 m) wide and 16 feet (5 m) high. Extending about 100 feet (30 m) into the hillside, the cave protects an historically important Pre-Columbian archaeological site from the ancient Dalton and Archaic period dating back to as early as 10,000 years ago.

Wikipedia: Graham Cave (EN)

Alleghany Springs Springhouse is a historic spring house located on the former grounds of Alleghany Springs, at Alleghany Springs, Montgomery County, Virginia. It was built about 1890, and is a two-tier, rustic, hip-roofed, octagonal pavilion. The structure is supported on rough cedar posts with complex intertwined knots of rhododendron branches and roots forming brackets, railings, and even vaulted "ceilings." At the center of the structure is the Alleghany Spring, that has been blocked.

Wikipedia: Alleghany Springs Springhouse (EN)

The Monocacy Aqueduct — or C&O Canal Aqueduct No. 2 — is the largest aqueduct on the Chesapeake and Ohio Canal, crossing the Monocacy River just before it empties into the Potomac River in Frederick County, Maryland, USA. The 438 foot aqueduct was built by three separate contractors between 1829 and 1833 at a cost of US$127,900.

Wikipedia: Monocacy Aqueduct (EN)

Darlington Covered Bridge is a historic covered bridge located in Franklin Township, Montgomery County, Indiana. It was built in 1868, and is a single span, Howe truss covered bridge that spans Sugar Creek. It measures 166 feet long and has an overall width of 22 feet.

Wikipedia: Darlington Covered Bridge (EN)