German predreadnought coastal defense battleship SMS Ägir.

Ship details: http://en.wikipedia.org/wiki/SMS_Ägir

Regioni class Italian protected cruiser Etruria on parade, Hudson-Fulton Celebration, Hudson River, New York,1909.

Ship details:

Displacement: ~2450 metric tons
Dimensions: 84.8m L, 12.03m W, 4.87m D
Machinery: 2 sets of three-cylinder triple expansion reciprocating steam engines, 2 propellers 7585 IHP
Speed: 19.8 knots at maximum power during sea trials
Endurance: ~2100 nautical miles
Armour: deck 51mm, tower 50mm
Armament as completed: four 6" 40-caliber guns, six 4.7" 40-caliber guns, eight 57mm 43-caliber guns, two machine guns, two 17,7" torpedo tubes
Armament 1905-1914: two 6" 40-caliber guns, eight 4.7" 40-caliber guns, eight 57mm 43-caliber guns, eight 37mm 20-caliber guns, 2 machine guns, two 17.7" torpedo tubes
Armament from 1915: six 4.7" 40-caliber guns, six 57mm 43-caliber guns, two 37mm 20-caliber guns, one machine gun, two 17.7" torpedo tubes

Etruria was laid down on April 4th 1889 at the Orlando Shipyard in Livorno (Italy), launched April 23rd 1891, and completed July 11th 1894. She sank on August 13th 1918 following the explosion of an ammunition barge in the Livorno harbour.

Source: Italian Warships of World War 1, by Aldo Fraccaroli, Ian Allan press, London, 1970, 304pp.

Blake class protected cruiser HMS Blenheim.

Ship details: http://en.wikipedia.org/wiki/HMS_Blenheim_(1890)

Battleship USS Idaho fitting out at New York Ship Building Corporation, June 23rd 1919.

Note the lack of hull-mounted secondary armament. According to navsource.org, she was the first battleship to be completed without such guns as their ports were plated over before her commissioning; however, the emplacements remained as her hull was otherwise like that of her sister ships.
Ship details: http://en.wikipedia.org/wiki/USS_Idaho_(BB-42)

Imperial Japanese Navy battleship Fuso, Mitajiri, Japan, 1928.

Ship details: http://en.wikipedia.org/wiki/Japanese_battleship_Fusō

Imperial Russian Navy predreadnought battleship Tsesarevich at Qingdao, summer 1904.

Ship details: http://en.wikipedia.org/wiki/Russian_battleship_Tsesarevich

French battlecruiser/fast battleship Strasbourg.

Ship details: http://en.wikipedia.org/wiki/French_battleship_Strasbourg

German predreadnought battleship SMS Elsass in Kiel.

I have seen this photograph identified as both the SMS Elsass and her sister ship SMS Hessen. The name plate seems to read Elsaß rather than Hessen under forensic sharpening but appears mirrored left to right.
Ship details: http://en.wikipedia.org/wiki/SMS_Elsass

Giuseppe Garibaldi class Italian armoured cruiser Varese at sea, October 1st 1904.

Class details: http://en.wikipedia.org/wiki/Giuseppe_Garibaldi_class_cruiser

Battleship HMS Ajax, Grand Harbour in Valetta, Malta, 1921.

Ship details: http://en.wikipedia.org/wiki/HMS_Ajax_(1912)

Heavy cruiser USS Chicago, Philadelphia Navy Yard, May 7th 1945.

Ship details: http://en.wikipedia.org/wiki/USS_Chicago_(CA-136)

Imperial Japanese Navy heavy cruiser Myoko, March 31st 1941.

Ship details: http://en.wikipedia.org/wiki/Japanese_cruiser_Myōkō

Imperial Russian Navy predreadnought battleship Tri Sviatitelia in Sevastopol.

She had the thickest armour ever carried by a Russian battleship and her 12" guns were 40 calibres in length, a gradual increase following the 35 calibres of the previous Navarin and 30 calibres of the Dvenadsat Apostolov.
Ship details: http://en.wikipedia.org/wiki/Russian_battleship_Tri_Sviatitelia

French predreadnought battleship Patrie.

Ship details: http://en.wikipedia.org/wiki/French_battleship_Patrie

German predreadnought battleship SMS Schlesien in Swinemünde.

Ship details: http://en.wikipedia.org/wiki/SMS_Schlesien

Italian protected cruiser Giovanni Bausan, Great International Naval Review (aka Columbian Naval Review), Hampton Roads, April-May 1893.

Ship details: http://en.wikipedia.org/wiki/Italian_cruiser_Giovanni_Bausan

Predreadnought battleship HMS Benbow in the 1890s.

Ship details: http://en.wikipedia.org/wiki/HMS_Benbow_(1885)

Heavy cruiser USS Louisville, Australia, February 2nd 1938.

Ship details: http://en.wikipedia.org/wiki/USS_Louisville_(CA-28)

Imperial Japanese Navy battlecruiser Hiei, Sasebo (Japan), December 21st 1915.

Ship details: http://en.wikipedia.org/wiki/Japanese_battleship_Hiei

Imperial Russian Navy predreadnought battleship Slava in Toulon (1910-1911?).

Ship details: http://en.wikipedia.org/wiki/Russian_battleship_Slava

French battleship Courbet, July 28th 1933.

Ship details: http://en.wikipedia.org/wiki/French_battleship_Courbet_(1911)

German battlecruiser SMS Seydlitz in Kiel Bight.

Ship details: http://en.wikipedia.org/wiki/SMS_Seydlitz

Italian battleship Giulio Cesare passing the Ponte Girevole in Taranto, 1937-1938.

This swing bridge spans the channel that links the Mar Grande bay to the Mar Piccolo lagoon.
Ship details: http://en.wikipedia.org/wiki/Italian_battleship_Giulio_Cesare

Close-up of the secondary armament on the battleship HMS King George V, Melbourne, October 29th 1945.

Ship details: http://en.wikipedia.org/wiki/HMS_King_George_V_(41)

Battleship USS Indiana getting painted prior to her shakedown cruise, Hampton Roads, September 8th 1942.

Ship details: http://en.wikipedia.org/wiki/USS_Indiana_(BB-58)