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Santa Bárbara Castle (Valencian: Castell de Santa Bàrbara, Spanish: Castillo de Santa Bárbara) is a fortification in the center of Alicante, Spain. It stands on Mount Benacantil (166 m) bordering the sea, which gave it enormous strategic value since from it you can see the entire bay of Alicante and its land surroundings.
The oldest underwater rail tunnel in the world, crossing the Mersey in Liverpool: 1.21 km: 1881–1886 Severn Tunnel: Wales – England: One of the oldest underwater rail tunnels in the world: 7.01 km: 1873–1886 Blackwall Tunnel (western) London, England: The oldest underwater vehicular tunnel in the world, crossing the Thames in London: 1.35 ...
At its lowest point, it is 75 m (246 ft) below the sea bed and 115 m (377 ft) below sea level. [5] [6] [7] At 37.9 km (23.5 miles), it has the longest underwater section of any tunnel in the world and is the third-longest railway tunnel in the world. The speed limit for trains through the tunnel is 160 km/h (99 mph). [8]
The sea ceaselessly erodes the rocky coast creating tunnels, arches, and caves. The island of Gaztelugatxe is in the center of this section of the coast next to the small Aketx island, a sanctuary for marine birds. Next to the hermitage, there is a small shelter with sea views that are used for picnicking and for refuge from the wind.
The Dolmen of Guadalperal completely visible due to a low water level in the Valdecañas reservoir. The Dolmen of Guadalperal, also known as the Treasure of Guadalperal and as the Spanish Stonehenge for its resemblance to the English Stonehenge, [1] is a megalithic monument dating from around 5000 BC and are thus 2000 years older than the earliest phases of Stonehenge.
A water castle, sometimes water-castle, [a] is a castle where natural or artificial water is part of its defences. [2] [3] It can be entirely surrounded by water-filled moats (moated castle) or natural waterbodies such as island castles in a river or offshore. The term comes from European castle studies, mainly German Burgenkunde.
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The Aqueduct of Segovia (Spanish: Acueducto de Segovia) is a Roman aqueduct in Segovia, Spain.It was built around the first century AD to channel water from springs in the mountains 17 kilometres (11 mi) away to the city's fountains, public baths and private houses, and was in use until 1973.