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A bike trail passing through a former railroad tunnel.
Autumn in Watkins Glen State Park, near Seneca Lake, New York State, USA.
Au bord de la Sarine dans le canton de Fribourg. \nSon appellation en allemand est Saane,
St. Catharines, Canada.
Entry portal of a cave in a limestone mountain
Cave system Skocjan, Unesco's world heritage site, Slovenia.
Scenery at Dry Falls, North Carolina, USA
Landscape view of Wang Sila Lang canyon at pua District nan.Nan is a rural province in northern Thailand bordering Laos
The landscape of Ob-Karn national park in the northern part of Thailand.
The Natural Bridge Aerial View - Rockbridge County Virginia State Park Trail
The river has one of the most beautiful river shades.
Autumn in Watkins Glen State Park, near Seneca Lake, New York State, USA.  There are people on the bridge over the gorge.
Cevennes National Park in evening mood
Gilfenklamm gorge. Racines. Autonomous Province of Bolzano. Trentino-Alto Adige. Italy.
Cave church, panorama from man-made caves, Lesnovo, Macedonia. In the peaks of mountain near monastery complex there are a number of man-made caves, and commemorative plaques.
Mountain crystal clear creek in the woods
Small, natural rock tunnel in Hocking Hills, Ohio
Fall color foliage hits Cuyahoga Valley National Park.
Photography of springs, pure and natural emerald water
Water fall between large rocks covered in moss in dense rainforest environment
An old water diversion tunnel along a river.
The entrance to the impressive ice cave in Scarisoara, in the Transylvania region of Romania. The cave is located at an altitude of 1165 metres above sea level. It is 105 m deep and 720 m long, and the entrance shaft (60 m in diameter and 48 m in depth) gives access through metal stairs to a large chamber, (108 m long, 78 m wide) - The Big Hall. From this point three openings lead to The Church (in front, with over 100 stalagmites), Great Reservation, Coman Gallery and Little Reservation (right). The part that tourists can visit includes the entrance shaft, The Big Hall and The Church, the other chambers,which can be visited only with the agreement of the Speological Institute of Cluj-Napoca, being reserved for scientists. The glacier has a volume of 75000 cubic metres and has average thickness of 16m. The glacier is reflected in the frozen lake inside the cave. Horizontal colour image with copy space.
A stream flows under a tunnel and into a pool and then to Denny Creek in Washington State.
St. Catharines, Canada.
Cascata dell'Orrido di Bellano.
Mountain creek on the Old Mountain or Stara Planina, Serbia
The Subway - Zion National Park
Kasama city, Ibaraki prefecture.
Exploring a massive cave in a sinkhole at Ha Ha Tonka State Park by Lake of the Ozarks.
This is a photograph taken on a mobile phone outdoors of autumn leaves surrounding waterfalls in Watkins Glen state park in New York during autumn of 2020.
Free Images: "bestof:LongwoodSwallet.jpg Entrance to Longwood Valley Sink Longwood Swallet a karst cave in the Mendip Hills in Somerset England own 2007-04-15 Mike Belch Cheesy mike"
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