A couple of good internal grinding images I found:
Netherlands-4712 – Euromast
Image by archer10 (Dennis) OFF
PLEASE, NO invitations or self promotions, THEY WILL BE DELETED. My pictures are Cost-free to use, just give me credit and it would be nice if you let me know, thanks.
Euromast is an observation tower in Rotterdam, constructed amongst 1958 and 1960. It was built for the 1960 Floriade, and is a listed monument because 2010. The tower is a concrete structure with an internal diameter of 9 m (30 ft) and a wall thickness of 30 cm (12 in). For stability it is constructed on a concrete block of 1,900,000 kg (four,200,000 lb) so that the center of gravity is beneath ground. It has a observation platform and a restaurant 96 m (315 ft) above-ground. Initially 101 m (331 ft) in height it was the tallest constructing in Rotterdam. It lost this position for a although, but regained it when the Space Tower was added to the leading of the developing in 1970, providing an additional 85 m (279 ft). Euromast is a member of the Planet Federation of Fantastic Towers.