how many stairs to the top of astoria column
Astoria Column The Astoria Column is a tower in the northwest United States, overlooking the mouth of the Columbia River on Coxcomb Hill in Astoria, Oregon. Built 92 years ago in 1926, the concrete and steel structure is part of a 30-acre (12 ha) city park. The 125-foot (38 m)-tall column has a 164-step spiral staircase ascending to an observation deck at the top and was added to the National Register of Historic Places on May 2, 1974.
Eiffel Tower Work on the foundations started on 28 January 1887.[15] Those for the east and south legs were straightforward, with each leg resting on four 2 m (6.6 ft) concrete slabs, one for each of the principal girders of each leg. The west and north legs, being closer to the river Seine, were more complicated: each slab needed two piles installed by using compressed-air caissons 15 m (49 ft) long and 6 m (20 ft) in diameter driven to a depth of 22 m (72 ft)[16] to support the concrete slabs, which were 6 m (20 ft) thick. Each of these slabs supported a block of limestone with an inclined top to bear a supporting shoe for the ironwork.