Architectural terms

Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
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Across:

3. mixture of lime, sand and water, for joining stone or brick, concrete
5. [literally ‘eye’] a circular opening at the top of a dome
7. a kind of limestone quarried near Tivoli, much used [in ancient and modern times] for building in Rome
8. lowest section, base of column
9. flattened column, attached
11. recess in wall, usually containing a statue
13. channels or grooves, vertical, on shafts of columns
14. having a row of columns in front
15. the main chamber of a temple, containing the cult statue;
16. top section of a column
18. an open courtyard or garden surrounded by colonnades
20. the triangular space of the façade of a building formed by the gable end of
22. the hemispherical roof of a circular or polygonal building
23. freestanding masonry support
24. masonry built against wall for additional support
25. line of arches, supported on columns
26. an arched roof covering a passage or room
27. a semicircular recess in a wall [usually the end wall] of a building, often roofed with a half-dome
28. exterior

Down:

1. a continuous horizontal band resting on the architrave, either left plain or decorated with relief carving, below the cornice
2. the highest member of the entablature, immediately below the roof
4. lowest section of classical entablature, horizontal beam resting directly on capital’s pillars
6. a post, normally circular in section, supporting an entablature
10. the stage of a theatre
12. a row of columns, usually fronting a covered walk
17. an ornamental fountain
19. a building of circular plan
21. term applied to columns which partially project from a wall and are not freestanding
23. high basement to temple, with three vertical faces, steps at principal end